Auto Sentry Wireless Anti–Theft System Auto Sentry is a plug and play vehicle alarm system. It utilizes sophisticated sensors to detect any unauthorized entry into the passenger cabin and sends a wireless signal to sound a remote alarm mounted in the engine compartment. It provides a visible and audible deterrent to thieves targeting the vehicle itself, or any loose valuables inside the vehicle. Security Sensors detect shock, glass breakage, and voltage drop Arms and disarms using a secure bit rolling code transmitter which cannot be sniffed, grabbed, or hacked Once triggered, alarm will continue to sound even if sensor is removed from socket Convenience Installs in minutes No need to spice into wires Sensor plugs into any available VPA or cigarette lighter socket Features an internal battery with trickle re-charge for use in sockets that are not constantly powered Compatible with all factory installed and aftermarket security systems