Engage all students in classroom activities – they can tap in with their own recorded sounds.Record up to 7 seconds per buzzer – just tap, record, tap, and listen.The 4 buzzers come in 4 colours and include an Activity Guide.Great for the whole class or for engagement in small groups.Each buzzer measures 9cm in diameter and requires 2 AAA batteries, not included.Note: Buzzers do not light up, and are not compatible with Alexa