Door Guard Hanging Door Knob Alarm

Simply hang this alarm from any metal door knob, and if movement is detected, a loud alarm will sound to scare away intruders. The portable alarm is great at home or in hotels no tools or wiring needed. Features variable sensitivity settings and an emergency LED light. Req. 2 "AAA" batteries (sold separately). Plastic. 2"L x 1 1/2"W x 7"H.