Stored unused since purchase. Received at school, but using something else. This is a SONIC Riana Tiara security alarm. Prevents the common problem of security alarms: "unnecessary ringing due to accidental operation"! The strap doesn't dangle, making it difficult to accidentally trigger! Water-resistant (IPX4) for peace of mind on rainy days! Cute heart shape! Large pull ring that's easy for children to grab. Can be attached to backpacks and bags with a fixed belt or metal hook. The pin doesn't come out completely, so it won't get lost. Includes a test AA battery. High volume 93dB (measured 1m in front). Safe in emergencies. It's hard to see in the picture, but there's a belt on the back of the buzzer, so it doesn't dangle, preventing accidental pulling and reducing the chance of accidental activation. For first graders Entrance ceremony