eWeLink 433Mhz Door Window Alarm Sensor Wireless Door Sensor Anti Theft Alarm Compatible With Alarm Host or RF Bridge For Smart Home Automation Secur

eWeLink 433Mhz Door Window Alarm Sensor Wireless Door Sensor Anti-Theft Alarm Compatible With Alarm Host or RF Bridge For Smart Home Automation Security Alarm System Note: This sensor can't work alone, it must work with 433MHz alarm system or Sonoff RF Bridge 433.Overview:This is a door and window alarm sensor. The door alarms can work with Sonoff RF Bridge 433, alarm system, etc. The door alarm sensor detects the opening status and immediately sends alarm notification message to the APP. Specifications:Power Supply: 2* 1.5V AAA Alkaline battery (not included)Wireless frequency: 433.92MHzProtocol: EV1527Action distance: ≥15mmLaunch distance: ≥150m (open area)Quiescent current: ≤5μAEmission current: ≤10mABattery life: 12-18 monthsOperating environment: -10℃-50℃ (14℉-122℉)Size: Main body (D*W*H): 71*26*20mmDeputy body (D*W*H): 45*12*16mmPackage Information:Package Size: Approx. 7.5 * 5 * 2cm / 3 * 2 * 0.79inPackage Weight: Approx. 42g / 1.5ozPacking List:1 * Wireless Door / Window Sensor1 * Set of Mounting Stickers  *With low battery remind function *Low-consumption chip design, which can make it work long time. *High Sensitivity. Excellent design, tiny and fashion. Easily install with stickers. *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.