Make games fun and exciting with Learning Resources Barnyard Answer Buzzers.Each of the 4 audio-only buzzers is pre-programmed with a distinctive attention-getting farmyard sound (Cock-a-doodle-doo!, Moo!, Neigh! & Bark!).The sounds are loud enough to be noticed in the classroom and at home and are great for shy children.Each buzzer measures 9cm in diameter and requires 2 AAA batteries, not included.Note: Buzzers do not light up, are not programmable and are not compatible with Alexa