1. This 2-in-1 wireless vibration and door contact sensor not only accurately detects vibrations or glass breakage on doors and windows, but also detects unauthorized opening of doors and windows. Once triggered, the sensor sends a 433MHz wireless signal to the alarm host, which then activates the alarm. It must be used with a 433MHz alarm host or Wi-Fi gateway and cannot operate independently 2. It is suitable not only for door and window protection but also for safes, vending machines, garages, car doors, vehicle fuel tanks, display cases, important equipment, and valuable paintings. 3. It supports 5 levels of vibration sensitivity adjustment, minimizing false alarms caused by irrelevant vibrations such as wind or noise. Parameters: 1. Wireless signal frequency and protocol: 433.92MHz/1527 2. Wireless transmission distance: greater than equal 100 meters outdoors in open space, approximately 50 meters indoors (laboratory test data, for reference only). 3. Power supply battery: 1 CR2032 button battery 4. Operating voltage: 3V 5. Low voltage alert threshold: 2.4V, red light stays on 6. Battery standby duration: over 2 years 7. Battery operating duration: over 1.5 years (based on a test trigger frequency of 10 times per day) Adjust Vibration Sensitivity: Press and hold the SET key for 5 seconds. Release the key when the red and blue lights are on, and then it will start flashing (the number of flashes indicates the current sensitivity level of the sensor). Color:White Material:ABS Package Contents: 1 * door opening sensor set 1 * double-sided tape