This personal alarm may be secured to a belt or clothing with the included belt clip or attached to a purse with the included lanyard. When the safety pin is removed from the alarm the loud and piercing 130 decibel alarm will sound. This alarm will sound for up to 2 continuous hours. With an unbreakable plastic shell and small size -measures 3 inches x 2 and one-eighths inches x 1 and one-eighths inches-this alarm is perfect for keeping yourself and your property safe. This alarm requires 1 9 volt battery that is not included. For a personal alarm with a light see item SWPDAL.This personal alarm may be secured to a belt or clothing with the included belt clip or attached to a purse with the included lanyard. When the safety pin is removed from the alarm the loud and piercing 130 decibel alarm will sound. This alarm will sound for up to 2 continuous hours. With an unbreakable plastic shell and small size -measures 3 inches x 2 and one-eighths inches x 1 and one-eighths inches-this alarm is perfect for keeping yourself and your property safe. This alarm requires 1 9 volt battery that is not included. For a personal alarm with a light see item SWPDAL.