Item Type: Window Door Detector Material: ABS Uses: Home, office, hotel, apartment, villa Battery: 1 x 12V 23A battery (excluded) Transmitting Frequency: 433MHz Transmitting Distance: Approx.100m/ 328.01ft(open space) 1、Low battery reminder, when the battery is too low, the door sensor red light will flash every 3 seconds, and at the same time it will feed back to the alarm host, and the host will prompt the owner that the battery is low. 2、The working principle of the door magnetic alarm: When the door and window are opened (the main unit and the magnetic stripe are separated), an alarm will sound immediately. 3、Intelligent matching of various alarm hosts, built?in 433MHZ imported wireless module, fully compatible with various 433MHz alarm hosts and on?site alarm equipment. 4、The tamper?proof button design on the back, when the transmitter is dismantled, the tamper?proof button will be triggered, the indicator light flashes instantly, and an alarm signal is sent to the host immediately. 5、Optimized circuit design, high performance and low power consumption, using ABS imported environmentally friendly plastics, no radiation and more worry?free. 6、The door is not closed reminding, more intimate, when the owner is out and the wireless door sensor is in a separated state, the alarm host cannot be armed, and the door sensor will voice prompt that the doors and windows are not closed. (This function needs to be equipped with the host) 2 x Door Sensor 4 x Screw 1 x Manual 2 x Sticker