Fill your classroom with fun noises and sounds that will keep students engaged. A great addition to educational games, these fun buzzers allow you to record up to 7 seconds of words, sounds or music. In orange, green, blue and red, these buzzers are easy to use and kids will love learning from them! Plastic. (4 pcs. per unit) 3 1/2" diam. Requires 2 "AAA" batteries, not included.