Description: Model: KR-DO26 Launch distance (open place): 100 meters Transmission frequency: 433MHZ Working voltage: 12V Alarm output: alarm report, anti-dismantling report Internal battery: 1 12V/23A alkaline battery Specifications: Wireless door sensor detector, guarding for doors and windows, for safety protection Intelligent matching of various alarm hosts, built-in 433MHz imported wireless module, fully compatible with various 433MHZ alarm hosts and on-site alarm equipment in the market The tamper-proof design is very safe. The tamper-proof button on the back is designed. When the transmitter is dismantled, the tamper-proof button will be triggered, and the indicator will flash instantly, and an alarm signal will be sent to the host immediately Widely used, suitable for all kinds of doors and windows, as long as there are doors and windows, and where there are hidden safety hazards, it can be used, iron doors, wooden doors, glass doors, etc. The working principle of wireless door sensor: After the door sensor is paired with the host, when someone opens the door and window (the magnetic stripe is separated from the transmitter), the transmitter immediately feeds back to the host, and the host immediately calls/sends text messages to notify the host Package Included: 1 pair of door sensors, 1 pair of stickers