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 and fashion.*It also comes with tamper protection to ensure system integrity.*Simply attach one piece to your door or window, and 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