Door Open Closed Detector Wireless Mini Magnetic Door Alarm Sensor for Window Garage Home Security Item Type: Door Open Closed Detector Material: ABS Battery: LR03 1.5VAAA battery x 1 700mAh (shipped with matching battery) Frequency: 433.92MHz Standby Current: Less than 40uA Working Current: Less than 100mA Standby Time: Greater than or equal to 2 years Working Temperature: -10 to 60 ℃ Working Humidity: Less than 90% Storage Temperature: -20 ℃ to 60 ℃ Magnet Distance: Less than or equal to Approx. 1cm / 0.4in Low Point Display: LED light flashes once every three seconds Default Encoding: 1527 This machine is equipped with two built in encoding selection switches. Choosing for KS encoding is compatible with our company's alarm host, while 1527 encoding is compatible with various alarm hosts (for GSM) and smart home gateways.