3 years & up. Get children actively engaged as you assess them! These buzzers are the perfect tool to turn learning into a fun, engaging experience. Pull them out at the end of lessons or for test reviews and turn studying into a game! Use them to make homework time more exciting or create other games for play time. If there are any children that struggle with confidence in front of others or can't speak very well these buzzers can also be used to help them gain the attention of those around them. Inspire confidence and promote fun! Made from quality, non-toxic materials. Set comes with 4 differently colored buzzers with fun sounds, such as: horn honks, boxing bell, doorbell, and "boing!" Buzzers measure 3.5" Diameter. Requires 2 AAA batteries, not included.