Light and sound buzzers provide a great way to boost student response during your classroom activities or games. Lifelike sounds replicate sounds from the real world to add to the entertainment. Buzzers also enable students to work on their own while allowing them to signal when they need help. Buzzers require three AAA batteries (sold separately) and are designed for children ages 3 and up. Size: 19.8 x 19.8 x 5.3 cm.