This 120 decibel alarm deters attackers and alerts bystanders of an emergency situation. Features pull-pin or panic-switch activation. Use the wrist strap for hand-held carrying or a belt clip to attach the alarm to your clothing or bag. Flashing alert light instantly identifies person in need. Alarm test button also works to activate the light to use as a flashlight. Compact size makes the alarm easy to carry in a purse or pocket. Uses one 9-volt alkaline battery (included).Size 2-1/4″ x 2-3/4” x 1″