The key chain personal safety alarm is small, compact and easy to carry anywhere. Should you need to thwart an attacker, or draw attention to yourself if attacked, just press the panic button and the key chain alarm will emit an ear piercing, 118 decibel scream that is guaranteed to attract attention! This alarm has three functioning modes: (1) By slightly pressing the alarm button, you can sound a warning chirp; (2) Depress the panic button completely, and you will sound the continuous 118 dB alarm; (3) Built in light serves as an aid in finding the keyhole on your car or entry door in the dark. Battery included. 2-1/2" x 1-1/4" x 1/2"