This wireless door contact from Yale is compatible with all Easy Fit Alarm Kits and offers peace of mind and security. It is ideal for increasing security around your home, especially at night. The sensor is lightweight, compact, and slim, making it suitable for main access points. It activates the alarm when a door or window is opened. Please note: this device is not compatible with the Sync & HSA Range of Alarms. It is ideal for homes with pets and is supplied with fixings and battery. This product comes with a 2-year guarantee.