The wireless contact sensor is an accessory of smart alarm system.
It’s fashion design, energy saving, and low battery warning supported, it also has great "Ready to arm" feature which will alert opening door/window when system is arming or home arming.
Standby Time: 24 Months
Low Battery Warning: Supported
Ready to Arm: Door/window opening alerts supported
Power Supply: DC 3V (1 x CR2032 battery)
Transmission distance: Up to 200M without obstacle
Standby Current: <2μA
Transmission Current: <20mA
Working Temperature: -10ºC~40ºC
Humidity: ≤90%rh (non-condensing)
Weight: 35.0g(battery included)
Dimension(L×W×H) : 80.0mm×35.0mm×12.0mm(Transmitter), 80.0mm×12.0×12.0mm(Magnet)