Features 1.Various Application: The security system is designed to fortify your home with an additional protection, perfect solution for apartments, mobile homes, offices, hotels, garages and so much more. 2.Safe and Secure: This door window alarm can instantly detect any movement in your door or window, magnetic sensor, extremely reliable in any condition. 3.User Friendly: The door alarm for home security system is intuitive and easy to use functionality. Move the sensitivity switch to H, M and L, which means to adjust the high, medium and low sensitivity of pressure sensing. 4.Easy to Install: The alarm system can be easily installed, can prevent children from sneaking out, and intruders from breaking in, ensuring safety at all costs. 5.Smart Design: When the power switch at the end of the door stopper is turned off, the 120 dB treble siren is not activated and the alarm sensor can be used as a regular anti slip door stopper.Specification Item Type: Door Stop AlarmBattery: 9V Alkaline Battery (Without Batteries)Package List 1 x Door Stop Alarm