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

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 an alarm notification message to the APP. 

• With low battery remind function 

• Low-consumption chip design, which can make it work a long time

• High Sensitivity. Excellent design, tiny, and fashionable. 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.

Specification:

• Power Supply: 2* 1.5V AAA Alkaline battery (not included)

• Wireless frequency: 433.92MHz

• Protocol: EV1527

• Action distance: ?15mm

• Launch distance: ?150m (open area)

• Quiescent current: ?5?A

• Emission current: ?10mA

• Battery life: 12-18 months

• Operating environment: -10?-50? (14?-122?)

• Size: Main body (D*W*H): 71*26*20mm

• Deputy body (D*W*H): 45*12*16mm

• Note: This sensor can't work alone, it must work with 433MHz alarm system or Sonoff RF Bridge 433.