Wireless Two-way Door Sensor

Open & close detector
This wireless door sensor is two way sensor , when you open and close the door or window , The sensor will send our difference RF Signal code , The alarm panel will display the door/window state by the signal code , So you can check the alarm panel to know the door and window closed or opened .
Low battery code
When the door sensor in the low battery , The sensor will auto send alter code to the alarm panel , and informed you to exchange the battery.

Please noted the difference between the door open sensor and two way door sensor
Door open sensor : It only have one signal code when door open(sensor separate )
Two way door open & close sensor: This type sensor have two signal cost for door open and closed , This function can be use for the alarm model 103,105,107,108,109 , When you open the door/window open remind function , The alarm system need this type of the door sensor