Feature: 1. The earthquake detector is designed to provide instant warning of seismic activity by detecting the P wave (compression wave) of an earthquake. 2. The sensitivity of the earthquake detector can be adjusted, support automatic reset and cut‑off alarm when the earthquake stops. 3. It can be easily mounted on the wall without screws, nails or tools. 4. Earthquakes that occur many miles away can be detected, and a loud unique alarm sounds to remind you. 5. The earthquake detector can eliminate confusion, save valuable seconds and provide peace of mind. Specification: Condition: Brand New Item Type: Earthquake Detector Material: ABS Color: White Size: Approx. 16 x 7.5 x 3.5cm / 6.3 x 3.0 x 1.4in Power Supply Mode: 1 x 9V Battery (not included). Package List: 1 x Earthquake Alarm Detector Note: 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.