2-in-1 Personal/Door Alarm

This handy 2-in-1 Personal/Door Alarm works as both a burglar alarm and a personal safety device. Just hang it on any non-metallic doorknob, and it will instantly sound if someone touches the knob. You can also carry it with you and pull the metal chain to trigger a loud 120-decibel alarm that can scare off an attacker. It runs on a single 9-volt battery.