When it comes to the exersaucers you want something that is durable and safe for your little one to enjoy.
There are many different models on the market so keep reading if you are looking for the very best!
What Exactly is an Exersaucer?
An exersaucer is a baby activity station that entertains your little one. They are stable and generally have a circular base.
These are not baby walkers, these are stationary play centers and are an updated and much more safer design of these old models.
Also referred to as jumpers these are the ideal toy or gadget to have in your home when you want to take care of quick chores around the home.
Best Baby Exersaucers on the Market
Fisher-Price Rainforest Jumperoo
- Item arrives in frustration-free, easy-to-open packaging that’s 100% recyclable. For a gift-ready box, select “Ship in Amazon packaging” at checkout
- Exciting lights, sounds and music reward your baby's every jump
- Infant jumper with 360 degrees of play, including peek-a-boo tiger, bat-at monkey, rattle lizard, and more
- 3 adjustable height positions to grow with your baby
- No doorway required, plus fabric spring covers keep little fingers safe
Fisher Price are world famous when it comes to toys for kids and infants. It comes as no surprise that their Rainforest Jumperoo comes in at the top of our list.
- No doorway required
- 360 degree rotating seat
- Three position height adjustment
- AA battery operated (Not Included)
- Easy to store and move
- Lights, sounds and music
- Overhead toy bar with squirrel roller ball and two woodland friend spinners
- Light up musical piano
A motion sensor rewards your infant with sounds and lights when they jump. This exersaucer measures 32.0″W x 43.125″H x 37″D and has a maximum weight capacity of 25 pounds and maximum height of 32 inches.
The Rainforest Jumperoo is suited to infants who can hold their head up unassisted but are unable to walk or climb out of the exersaucer.
The rotating seat has soft spring overs to protect your childs fingers from getting pinched. With toys at 5 different locations on the platform your little one will be thoroughly entertained.
- A bobbling elephant
- Monkey swinging from a vine
- Parrot hanging from a bead bar
- Clear spinning bead ball
- Tiger that plays hide and seek
- Spinning lizard that makes rattling sounds
- Tethered chew toy
- Eye-catching graphics
Promoting learning through discovery the Rainforest Jumparoo is easy to store and move.
The frame of the exersaucer pivots to a nested position allowing for ease of storage and can be folded to carry from room to room.
Evenflo ExerSaucerJump and Learn Stationary Jumper
- Provides baby with secure learn and play environment
- 67 fun learning activities help babies achieve important developmental milestones
- Bounce base gives baby a soft landing pad that promotes stability in early development
- Smart electronic toys interact with one another providing baby with fun lights and sounds in 3 genres of music
- Extra jump allows baby to exercise legs while being entertained. Fit: Approximately 4 months to walking age or until child can stand flat-footed at the highest level
The EvenFlo Jumper Jam Session has 26+ fun learning activities which will help in your baby achieving developmental milestones.
- 100% Polyester
- Provides baby with secure learn and play environment
- 3 genres of music
- Soft jump landing pad
- 26+ learning activities
The toys developed and used on the Jump and Learn were developed with the Child Development Institute.
The base of this has been designed to help strengthen muscles as well as core strength and co-ordination.
With a 3-Position Height Adjustment you can get months of use from this product as your child grows.
Another great feature is the removable machine washable pad – making it convenient and easy to clean.
Suitable for babies from 4 months old to walking, a maximum height of 30 inches and a maximum weight of 24 pounds. This exersaucer requires 12 AA batteries that are not included.
Assembled the EvenFlo Jumper Jam Session has a total weight of 16 pounds and 35″ W x 35″ D x 39″ H.
Baby Einstein Neighborhood Friends Activity Jumper
$84.00 in stock
- Captivates & cultivates your baby’s curiosity through 12 interactive activities with lights, songs, and sounds
- 5 easily-adjustable height positions to grow with baby
- Introduces new languages (English, Spanish & French) and promotes language development
- Fun and discovery come full circle with 360-degree seat rotation
- Toy stations wipe clean with a damp cloth; Seat cover is machine washable
Baby Einstein Activity Jumper offers 4 different activity stations as well as a 360 degree rotating seat for access to all the toys.
- Secure and safe
- 12 different activities
- Adjustable to 5 different heights
- 360 degree rotating seat
- Machine washable seat
- Language learning in English, French and Spanish
The secure support seat provides comfort as well as stability for your little one. In addition there are 5 adjustable height positions to choose from.
This exersaucer promotes multi language learning with 4 activity stations offering piano, classic melodies as well as English, French and Spanish.
With a seat pad that is machine washable and toys that can be wiped clean this is an easy to maintain exersaucer.
3 AA batteries are required for the Baby Einstein which are claimed to last up to 20 hours.
Assembled this unit measures 30.5″ x 33″ x 29″ and has a maximum weight recommendation of 25pounds.
If you wish you can also add extra toys to the Baby Einstein Activity Jumper with link loops built into this design.
3-in-1 Around We Go Activity Center
$89.99 in stock
- More movement, more giggles, more happy moments
- Award winning sitting to standing Walker
- Baby Walker rotates around activity center
- Walker seat can be removed when baby outgrows it. Suitable for child less than 30” tall
Bright Starts Around We Go is a little different to the previous models as your infant can walk or waddle around the activity center.
- 15+ Activities for baby
- Easy to clean
- Seat rotates 360 degrees around the toy station
- BPA free, Lead free and non-toxic
This exersaucer can be used for years as the seat can be removed and it can be used as a stand up station.
With a piano station that has 3 play modes as well as a flip book that activates melodies your young one will be consistently entertained.
Great for enhancing action and reaction skills there is a bead chaser, popping characters and a spinner
Suited for infants aged 6 months up or to 25 pounds or 30 inches tall. This activity center requires 3 C batteries that are said to last 180hours.
5. Oribel PortaPlay 4-in-1 Foldable Travel Activity Center, Turn, Bounce, Play, Transform – Forest Friends
Oribel PortaPlay 4-in-1 Foldable Travel Activity Cente
- SPIN & BOUNCE! A 360 degree spinning seat with a slight bounce lets baby enjoy hours of fun!
- MINIMUM SPACE, MAXIMUM PORTABILITY. The PortaPlay has legs that effortlessly fold in on itself, making it super easy to fold away or to take a long for a weekend at grandma’s!
- TOYS THAT TEACH! Thoughtfully designed toys entertain and promote key developmental goals like fine motor skills and cognitive development.
- GROWS WITH THE CHILD! When your Little outgrows the activity center, swap out the seat and toys for the included covers to convert it into a play table! Add matching stools (bought separately) compliment the design of the PortaPlay and fits well in any modern home.
- HIGHEST QUALITY! Made with superior quality plastic that looks beautiful and lasts for years.
The Oribel PortaPlay is a foldable activity center that makes it the ideal travel companion.
- Ideal travelling companion
- Converts to a table
- 360 degree rotating seat
- Bouncing feature
- Easy to fold away and store
- Batteries not required
The Oribel is a designed for babies 5 months to walking and no more than 22pounds in weight.
While there are minimal toys compared with other stations those included have been carefully selected to develop motor skills and cognitive function.
The seat has an integrated elastic system which allows your baby to bounce and jiggle around. Another great thing is this model does not require batteries for it to work.
With legs that quickly and simply fold away transporting and storing this activity centre is incredibly easy.
When the time comes and your little one has outgrown the Oribel PortaPlay it then converts into a table. You can also purchase additional stools to go with it. A great way to get maximum use from it.
Evenflo Exersaucer Triple Fun Active Learning Center
$144.99 in stock
- Playmat, exersaucer and activity table in one unit provides for extended usage as your child grows
- Portability folds significantly smaller that makes travel and storage easy
- 11 age-appropriate toys and fun music help baby achieve 10 developmental milestones such as fine motor skills, object exploration, tactile development and more
- 3-position height adjustment grows with baby seat locks in multiple positions
- Removable, machine washable pad
The Evenflo Exersaucer Life in the Amazon is an animal/jungle themed model that is stimulating and exciting for your little one.
- Playmat, exersaucer and activity table all in 1
- Easy to fold and store
- 11 activities
- 3 position height adjustment
- Machine washable
- Requires 9 AAA alkaline batteries (not included)
The great thing about the Life in the Amazon Evenflo is that it can be used from the moment you bring your little one home until the age of 2+ years.
With the Life in the Amazon theme your child will be surrounded by exotic animals providing endless entertainment.
There is a 3 position height adjustment feature which allows you to adjust as your little one grows.
Machine washable pad makes it easy to clean and maintain and the plastic components can be wiped with a cloth.
As a general guide the playmat can be used from 0-4months, activity centre 4months to walking and the activity table from walking to 24months.
Assembled the Evenflo Exersaucer Life in the Amazon measures 31.5″ x 30″ x 30″ and weighs 22.5 pounds.
Evenflo ExerSaucer World Explorer Triple Fun Saucer
- Stage 1 Playmat - Comes with a $40 Value, 24" x 24" soft, cushioned, slip-resistant, easy-to-clean, padded mat for tummy-time or baby care
- Unique developmental toys include the Learning Language Pod, featuring 12 pages, 36 different sounds and 4 languages
- There are 11 age-appropriate, removable toys and fun music that help baby achieve 10 developmental milestones such as fine motor skills, object exploration, tactile development and more
- Has a convenient machine-washable seat pad that is easy to remove
- Easy to grab handle makes travel and storage easy
Evenflo World Explorer offers unique developmental toys including a 12 page book, 36 different sounds and 4 different languages.
- 11 age appropriate toys
- Machine washable seat
- Easy to carry, transport and store
- 3 height positions
- 4 different languages
- Electronic toy bar
The Triple Fun World Explorer lets your little one explore and expand their little mind from the comfort of their seat.
Included in this exersaucer is an electronic toy bar that offers lights and sounds to assist in developing motor skills.
A cushioned mat is also included in the purchase for tummy time. There are 3 adjustable heights to account for your growing baby.
Extended use and value for money comes as the Evenflo World Explorer can be converted into an activity table when your little one outgrows it.
The mat, exersaucer and activity table is suited to newborns to 24 month olds.
Evenflo Exersaucer Bounce and Learn Sweet Tea
- 3 position height adjustment grows with child to provide maximum product value
- Removable, machine washable seat pad providing easy and convenient cleaning.Maturity: Discontinue use if child can walk, stand flat-footed in the ExerSaucer in the highest adjustment level or climb out of the product
- Provides physical exercise to develop baby's neck, back and leg muscles and improve motor skills; Provides baby with a secure learning and play environment
- Helps in development of gross and fine motor skills: object exploration, cause/effect learning, self-awareness, tactile development, visual development, object permanence, hand-eye coordination
- Discontinue use if child is 30 inches tall
Evenflo Bounce and Learn Sweet Tea Party is the final exersaucer to make the reviews.
- 3 position adjustable
- Machine washable seat
- No batteries required
The Sweet Tea is a battery free exersaucer that still provides age appropriate toys to entertain your little one.
With a rocking, spinning and bouncing action your little one will be strengthening their whole body.
The frame of this model is lightweight and have easy to move around. It is also adjustable to 3 different heights allowing you to get maximum use.
There are three different themes to choose from – tea party, polar playground and zoo friends although these models have different prices.
The removable, washable pad makes it very easy to clean and maintain the Evenflo Bounce and Learn Sweet Tea Party. Suitable until your little one is taller than 30inches.
Baby Einstein Neptune's Ocean Discovery Jumper
- Dive into discovery with ocean-themed activities in every direction
- Bouncy seat swivels 360° from toy to toy
- 4 height positions are easy to adjust.Adult assembly required
- Electronic sea turtle station is removable
- Introduces numbers & colors in English, Spanish, French
The Baby Einstein Neptune’s Ocean Discovery Jumper exposes your child to a world of fun with the attractive toys it has.
- 360 degrees rotation
- Ocean-themed toys
- Four height positions
- Easy-to-clean surface
- Removable electronic sea turtle station
- Numbers and colors
- Three languages
The jumper provides your little one with the opportunity to go round the toys and discover new pieces; thanks to the 360 degrees swivel function. This feature helps your baby to relate one item to the other and most times learn the difference between each. All the toys included are ocean-themed, and this can help your child learn more about underwater creatures.
The toys are a great start to introducing your baby about the underwater environment. That makes the jumper a great learning essential while ensuring the baby has fun in the process. With time, your baby can pinpoint their favorite toy and show interest in some.
The jumper allows height adjustment up to four positions. This makes it easy for you to customize a comfortable height for your little one. Also, the height adjustment makes the jumper useful as your baby grows. It allows the baby to jump and dance which can help them strengthen their leg muscles.
The design of this jumper does not include a doorway which makes it a safer option to older models. You can go about your business and watch your baby from a distance knowing they can leave the play station.
The jumper utilizes batteries for sound features. It is essential to replace them if one of the functions fails to operate. The jumper can help to teach your child numbers and colors in three languages. Those include English, French, and Spanish. It is a great learning tool and will most definitely entertain your little one.
Disney Baby Finding Nemo Sea of Activities Jumper
$139.99 in stock
- 13 plus engaging toys and activities
- Nemo rollerball toy station with dancing lights and ocean sounds
- Interactive Squirt themed piano
- Tad and Pearl characters remove from Mr. Ray for take along fun
- 1 starfish shaped link loop for adding baby's favorite toys
This Disney Finding Nemo Sea of Activities Jumper is a great choice to keep your baby entertained while helping them develop their mental skills with the toys that come in this jumper.
- 13 + toys
- Nemo-inspired theme
- Lights and music features
- Four height settings
- Removable toys
- Interactive piano
- Improved straps with buckles
This play station includes a Nemo Rollerball which inspires the baby’s senses with lights, melodies, and rattling beads. This feature can be distracting to your child leaving you time to take care of other tasks as they play. The jumper comes with Nemo characters that your baby will have fun playing with.
One of the toys, Bruce is a shark toy with colorful beads filled in the mouth. Squirt has a tummy that has keys that light up and play ocean-themed tunes. These among other toys will expose your child to the world undersea and have fun at it. The best part is that your child can easily access all the toys; thanks to the design of the jumper.
The jumper includes a high seat which provides extra support for your baby’s back. The seat rotates at 360 degrees so your child can discover all the toys in the play station. More on the design, this jumper adjusts to four height positions to customize the right height for your little one. This feature makes it ideal for every baby since they can use it for a longer time as they grow.
The baby jumper is designed to enhance the interactive spirit between the baby and the parent which can be an essential learning experience. It helps your baby relate to the toy characters included in the jumper and provides a nurturing environment for your baby. With the jumper, you will get more done every day without taking away the fun from your child.
Skip Hop Explore and More
- Designed in collaboration with a pediatrician, our baby activity center supports a “whole body” approach to play and learning. Our unique Discovery Window lets baby see their feet while they play to learn cause and effect.
- Easy to assemble, with toys that can be positioned anywhere for baby, it features a 360-degree rotating seat that turns and stretches for bouncing.
- As baby grows, our activity center converts for easy cruising—ultimately becoming a clean, sturdy table for coloring, playing and more.
- Three stages of use: Sit, swivel, bounce & play; Cruise & interact; Play table; 25 plus developmental activities
- Clip-on toys can be positioned based on baby’s abilities
This baby exersaucer involved the baby’s mind and body which enhances their development and improves their motor skills.
- 360 degrees rotating seat
- Grow-with-me feature
- Toy attachment system
- Three stages of use
- Discovery window
- Fitted piano
- Four movable toys
This activity center is designed to last long and withstand the constant jumping and tossing of your little one. It has a sturdy polyester material which is safe for use with babies and secure enough to withstand regular use. On this note, you can use the station for years as your baby grows.
One of the features that make this activity center essential for babies is that you can start using it for babies from 4 months. It features three stages of use which include a swivel function, bounce and play and sit.
As the baby grows, you can convert it to a play table with a plastic chalkboard surface. In the early stages of your child, this activity center will be a useful tool for development.
It features a toy attachment system which allows you to add as many toys as possible. It has clips that you can position anywhere around the circumference for your baby to explore more. This feature makes it easy to add the baby’s favorite and do away with what they do not seem to like.
The play station comes with 360 degrees rotating seat that allows your little one to go round the circumference. This function helps the baby to involve the leg muscles as they turn which is a significant development benefit. The discovery window allows the baby to see through the surface as they press the piano underneath.
Fisher-Price Animal Activity Jumperoo
- 360 degrees of play for baby to discover!
- Music, lights & sounds reward & encourage every bounce & jump
- Easily adjusts to 3 different heights as your baby grows
- Colorful toys include bat-at butterfly & toucan, giraffe with spinner-bead neck, froggy teether, lion slider & more!
- Removable, machine-washable seat pad
This Fisher-Price Animal Activity Jumperoo comes in a simple design that your baby can smoothly operate and have fun.
- 360 degrees swivel function
- Music, lights, and sound
- Adjusts to three heights
- Colorful toys
- Removable seat pad
One of the outstanding features of this jumper is the colorful design it has. It features a variety of bright colors which helps your baby’s developing senses. Also, the bright environment gives the baby the spirit of adventure and exploration to try and learn all the different toys. The design in itself makes the jumper your child’s favorite spot.
With the sounds that the jumper produces, you can be sure that the baby will be entertained all through. Babies love interactive sounds, and they can be distracted for some time as you handle other tasks. More to this, the jumper has inbuilt lights which will wow the baby the moment they sit on the jumper.
It features a 360 degrees swivel function that allows the baby to go round the jumper as they play with the toys. This design also helps the baby to keep up with your movements without necessarily moving the jumper. The bouncy seat helps the child to strengthen the leg muscles as they reach for the hanging toys.
As much as these jumpers are intended for entertaining your baby, they are an excellent choice for keeping the baby physically fit. All the jumping, bouncing and stretching is a considerable workout for your little one. Your child can work out the small muscles and effect better development with a few minutes of playing at the station.
You can help your baby’s sensory development with this jumper. The colors, music, lights and different shapes can help them learn and relate to specific toys as they grow. The best part is that you can wipe down the station and clean the seat pad to maintain it in the best condition.
Infantino Sit, Spin & Stand Entertainer
$79.99 in stock
- Design: 3-in-1 Sit, Spin and Stand Entertainer grows with baby featuring 360 degree play including music, lights, and movable, drop-free toys in an easy to stow away design with fold-in toys and legs
- Developmental benefits: 6 engaging and interactive jungle themed toys encourage baby to explore with press and play lights and music including additional sound effects, all in a space saving design
- Adjustability: 3 height positions grow with baby, once baby is walking the play continues with toys that fold in, rolling toys that detach and a base tray which tops and locks on for pretend play
- Easy to Clean: Machine washable removable seat pad; easy-to-wipe clean toys and surfaces
- Infantino, smartly designed products for happy parenting: We design smartly, we have fun and we're overjoyed when an idea evolves full circle; into a product loved and used daily by parents everywhere
This multifunctional activity table is the right play accessory for your little one in their first years of life.
- Three stages of play
- 2-in-1 play station
- Three height positions
- Six engaging toys
- Folds flat for storage
- Requires 3AAA batteries
With this activity table, you can keep your little one entertained as they grow; thanks to the design. The play station transforms into a play table when your child grows, giving you value for your money. The child can spin 360 degrees as they explore the attached toys. It works well for babies from 4 months old all the way to 5 years of age.
The station includes glowing light and playful music that can keep your child engaged. With the toys included, they can play for hours as you go about other tasks around the house. This makes it an essential tool to engage your child without necessarily having to play with them all the time. You get more done, and your child enjoys their play times.
The tabletop design features beautiful nature scenery that adds on to the fun experience. With the three rolling animal toys, your child can have fun driving them around the table top surface.
As a play station for younger children, you can adjust the height to three positions depending on where the baby seems much comfortable to play for a long time.
With this activity table, you do not have to worry about storage. The legs fold underneath the surface of the table top for a flat design. This make sit compact for space saving storage and easy transportation when you need to take it away.
Sweet Safari Bounce-A-Round Entertainer
$74.99 in stock
- Baby entertainer jam-packed with jungley joy
- Seat rotates 360 for all around adventure
- Grows with your wild one – adjustable height
- Pink activity saucer with 12 dynamic toys
- Bounce pad helps keep little toes comfy
If you are looking for a cute exersaucer for your little girl, you can get the Bright Starts Sweet Safari Entertainer.
- 360 degrees rotating function
- Adjustable height
- Pink color
- 12 dynamic toys
- Bounce Pad
- Variety of activities
Babies learn from what they see around the environment they live in. If your little child is always indoors, there is a need to introduce toys for play time. That way, they can explore different items and learn to differentiate each as they grow. This entertainer comes with simple yet essential toys for your child to experience a new world.
It has a jungle theme that includes toys in towering trees, tropical birds and exotic animals. It comes with 12 toys that your child can play with and stay engaged the whole time. More to this, the jumper is packed with bright colors which can help with the sensory development of your baby. As they grow, they can learn about different creatures and colors.
The entertainer is designed to grow with your baby. It features different height adjustments to suit the baby’s height. It is easy to pull and fit at the required height to ensure your baby is comfortable as they play. With the toys above the baby’s head, this entertainer helps the baby to stretch. That involves the leg muscles which can positively impact the baby’s development.
A few minutes of playing with this toy will keep your baby engaged. This not only helps to develop their senses but also keeps them physically fit. The constant bouncing, jumping, and stretching involve all the muscles of the baby. After playtime, you can be sure they will enjoy a restful nap out of high activity levels.
What a great way for your child to learn about animals than to get them this jumper for Fisher-Price.
- 360 degrees spin
- Free-standing frame
- Three height adjustments
- Comfy seat pad
- Music, sounds, lights
- Plenty of toys
The jumper features a comfortable seat that spins 360 degrees. With the colorful toys and the zoo theme, your child will have lots of fun sitting on the jumper. You can expect your little one to be marveled by the rhino and hanging gorilla. More to this, they will have fun spinning the rainbow wheel as they roll the hippo and bite on the lion teether.
From the design, this jumper utilizes the different toys to not only entertain the child but also provide useful learning materials. Your child can have fun as they discover the animal kingdom. The colorful theme of the jumper helps the baby to develop differentiating skills by learning the creatures by the colors.
As your baby jumps and spins, they are rewarded by music, lights, and sounds. This feature encourages them to keep bouncing as they wait on the music to play. With all the toys and the light sparking after every jump, your child will want to stay in the station for hours. This will leave you time to handle other tasks while ensuring your baby is engaged all through.
One of the outstanding features is the adjustability of this jumper. As the baby grows, you can pull the adjusting strap to fit the most comfortable height for your little one. That makes it useful for your child, and they can enjoy for a longer time. The seat pad can be removed for regular cleaning. You can toss it in the machine for a quick wash and fix it back quickly.
An exersaucer is a much safer alternative to a walker although you will need to monitor how much time is spent using one.
Overuse can lead to problems such as poor posture and balance issues but these are fantastic for showers and using the bathroom.
When selecting the right exersaucer for your little one, it is essential to keep in mind some of the factors that determine its functionality. You want one that you can set up quickly and work well for your baby. On this note, it is essential to check the quality of components to ensure they are safe for use around the baby.
Also, you want to be sure the jumper can withstand regular use. Your baby will most likely want to spend some time every day on the jumper; therefore, it is essential to consider the durability features.
The design of the jumper determines how well your child will adapt to its use. Most of these come as free-standing stations which work best for the safety of your baby. You should avoid those that have a doorway that could accidentally open as your child plays.
The spinning function is a critical consideration in that you want to provide a design that your child can explore better. Spinning seats allows the baby to go round the jumper and reach for toys at any position. Also, this feature helps the baby to turn and keep up with your movements in the room.
How you maintain the exersaucer will determine how long it serves your child in the right condition. Most of the designs require a gentle wipe on the surface to ensure a clean play area for your baby.
Some jumpers come with removable seats that you can toss in the machine for a quick wash. Whatever the design you choose, be sure it works well for your child’s age and interests.
The Best Baby Exersaucers
Exersaucers are a fun way to keep your little one entertained when you need some hands free time. There are many on the market and these activity centers will keep your child stimulated and occupied.
- Fisher-Price Rainforest Jumperoo
- Evenflo ExerSaucerJump and Learn Stationary Jumper
- Baby Einstein Neighborhood Friends Activity Jumper
- 3-in-1 Around We Go Activity Center
- Oribel PortaPlay 4-in-1 Foldable Travel Activity Cente
- Evenflo Exersaucer Triple Fun Active Learning Center
- Evenflo ExerSaucer World Explorer Triple Fun Saucer
- Evenflo Exersaucer Bounce and Learn Sweet Tea, Party
- Baby Einstein Neptune's Ocean Discovery Jumper
- Disney Baby Finding Nemo Sea of Activities Jumper
- Skip Hop Explore and More
- Fisher-Price Animal Activity Jumperoo
- Infantino Sit, Spin & Stand Entertainer
- Sweet Safari Bounce-A-Round Entertainer
- Fisher-Price Luv U Zoo Jumperoo