1. This 2-in-1 wireless vibration and door contact sensor not only accurately detects vibrations or glass breakage on doors and , but also detects unauthorized opening of doors and . 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 , vending machines, garages, car doors, vehicle 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: equal 100 meters outdoors in open space, approximately 50 meters indoors (laboratory , 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: and hold the SET key for 5 seconds. Release the key when the red and blue lights are on, and then it 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 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.