The MINI TRAVEL ALARM with PIR SENSOR is an effective low cost motion alarm that can be used to effectively to deter an assailant. It can be activated by just pulling the alarm cord located at the top of the unit or can detect motion up to 9 feet away. Emits a loud 15 second, 100dB blast making an impending criminal cower and run. Just slide the cover down exposing the infrared sensor and the off/auto switch. Turn the switch to auto, and the sensor will start detecting motion in 60 seconds. Contains an LED flashlight, and its convienent size makes it perfect for concealing and traveling. Uses three AG13 batteries (included).