High-risk security situations do not leave any margin for error thus requiring intricate security procedures designed to ensure safety and piece of mind. The TM-915 has been created specifically with this in mind. TM-915 mainly used in detecting the close state of door and window, when the door or window opened as unknown reason and the detector will send out specific radio wave to alarm host to achieve remote alarm. 1.Wireless communication with Alarm Host; 2.Rolling code for anti-crack; 3. Super low power consumption; 4.Low voltage alert; 5.Anti High-frequency interference.