This personal alarm key holder is small and portable, can be hung in ladies bag, school bag, backpack, belt ring, suitcase, key, dog belt. This product is mainly used for night walking, especially single women walking situation, in violation & lost cases. Once you press the alarm, it will be ringing more loudly, sharp beeps can cause people's attention and get help. Shop Self Defense Person Alarm at 50% off at ShoppySanta.