1The earthquake detector is designed to provide instant warning of seismic activity by detecting the P wave (compression wave) of an earthquake. 2The sensitivity of the earthquake detector can be adjusted, support automatic reset and cut-off alarm when the earthquake stops. 3It can be easily mounted on the wall without screws, nails or tools. 4Earthquakes that occur many miles away can be detected, and a loud unique alarm sounds to remind you. 5The earthquake detector can eliminate confusion, save valuable seconds and provide peace of mind. Condition: Item Type: Earthquake DetectorMaterial: ABSColor: WhiteSize: Approx. 16 x 7.5 x 3.5cm / 6.3 x 3.0 x 1.4inPower Supply Mode: 1 x 9V Battery (not included) 1 x Earthquake Alarm Detector The installation site should be as far away from the door as possible to prevent the vibration of the closed door. Mounting on a hard wall or load-bearing wall allows for higher sensitivity. If you have children in your home, avoid exposing them to this product. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.