Uses 3 AAA alkaline batteries. Place it behind any door and when the door is opened, it gives off a loud, shill, pulsating alarm and prevents the door from opening more than a few inches. It will scare away intruders. Great protection for home, office or motel room when traveling. Sounds instantly when an intruder touches the door knob.
Alarm sounds instantly and continuously to call for help.
The slightest disturbance triggers the countdown Ten seconds later the powerful siren goes off. Features a 130 db siren. Re-arms itself immediately. C503 The Anti-theft Device is invisible to any potential thief, until he tries to steal your car. The car will not start, even if the thief has your ignition keys.