✽【NOTES】An Aqara Hub is required and sold separately. Requires a secured 2. 4 gigahertz WiFi network connection. The Aqara M2 or M1S Hub can connect up to 128 devices(*use of a repeater such as the Aqara Smart Plug or Aqara Smart Wall Switch(With Neutral) is required)..【VIBRATION DETECTION】Whenever the Aqara Vibration Sensor detects unexpected vibration, it will send alerts to your phone or activate the local alarm on the Aqara Hub..【VERSATILE MOVEMENT DETECTOR】The Aqara Vibration Sensor can also detect tilt and drop movements when it is attached to an object. Therefore, you can attach the sensor to your valuables or drawers and be notified if any movement is detected from the device..【HOME AUTOMATION】The Aqara Vibration sensor can be made to control and trigger other Aqara connected devices when vibration and or movement is detected..【EASY INSTALLATION】No wiring or screws required. In addition, If you have any questions, please feel free to contact us.