Note: It can only work with Chuango 315MHz G5\/A11\/B11\/H4 Plus alarm system, can't work with 433MHz alarm system The DWC-102 works well with any door, window or opening When triggered (separated), an alarm signal will be sent to the system controller for appropriate response If connected to a GSM alarm system, low-battery alerts via SMS text messages are possible Features:Low-consumption chip design, which can make it work long time High Sensitivity Excellent design, tiny fashion It also comes with tamper protection to ensure system integrity Simply attach one piece to your door or window, attach the other piece to the door or window frame Ideal intrusion warning for homes, apartments, mobile homes, dorms, offices, hotel rooms, garages, etc Specifications:Power supply: DC 1 5V (AA 1 5V LR6 Battery x 1 pc)Static current: 35uAAlarm current: 10mATransmitting distance: 80m (in open area)Radio frequency: 315MHzHousing material: ABS plasticOperation Condition: Temperature: -10C-55CRelative humidity: 80%(non-condensing)Item Size: 71 x 34 x 17 5mm (L W H)Package Size: Approx 16 11 5cm \/ 6 3 4 3 2inPackage Weight: Approx 130g \/ 4 6ozPackage List:1 315Mhz Door Sensor