This product is a wireless smart door sensor, which adds a reminder of unclosed doors and windows. Ultra-low power consumption chip design, low-voltage fault monitoring report, tamper-proof, Anti-vandal function. Compatible with 1527 encoding format, optional oscillation resistance, Long launch distance. Typically used in various household and commercial door and window anti-theft Alarm (note: this door magnetic sensor can only be connected to the alarm host and cannot be used independently) Power supply: CR2032 button battery Power consumption: <8uA (standby state) Sensing distance: 15mm Transmitting power: 10dBm Working temperature: -10/55/ Transmitting frequency: 433MHZ Encoding method: EV1527 T ransmitting distance: ≥120M Working Principle When the door or window is opened, the door magnetic sensor will transmit the signal to the alarm host. After the alarm host receives the signal, an alarm will sound. If your alarm host has the function of receiving and reminder, you will When the alarm host sounded the alarm sound, the mobile phone received a message reminder Scenes To Be Used Perceive the door and window switch on or off Easy installation Use 3M tape to fix the door sensor, easy to install Product Parameter Power supply: CR2032 lithium battery x1 Standby current: <8uA Alarm current: <15mA Transmission distance: <80 (open area) Wireless frequency: 433MHz