This sleek, compact modern design keychain attaches to backpack, purse or keys for convenient, instant access, plus greater value with built-in LED light and batteries included (requires 3xLR44). The 110 dB alarm helps call for assistance in an emergency and helps deter attacker (audible up to 500 feet/150M away). Simple to use; pull metal chain from device to sound 110 dB alarm. Push pin back in to stop sound and use again. Safe for children, and a self-defense option for any age.