Ideal for classroom games, these colorful buzzers are teaching aids that are perfect for oral quizzes, spelling bees and general knowledge competitions. Kids love the sounds - a siren, a game show buzzer, a laser and a voice saying "charge!". They're a great way to make students feel good about classroom participation. Plastic. (4 pcs. per unit) 3 1/2" Requires 8 AAA batteries, not included.