Detector Earthquake Get Early Warning of Impending Earthquake Quake Alarms LED Specifications: Item type: Earthquake alarm Color: White Item type: Anti-theft device Alarm sound pressure: 120dB Working voltage: DC 9V battery (not included) Induction method: vibration alarm Power-on delay: 15 seconds Installation: self-adhesive Product size: 100 × 53 × 28mm / 3.9x2.07x1.10inch Packing size: 105 × 60 × 42mm / 4.10x2.34x1.64inch (1cm=10mm=0.39inch) Measurement Details in the attached picture. Package included: 1x Earthquake Anti-theft alarm Features: -100% brand new and high quality. -The earthquake detector is designed to provide instant warning of seismic activity by detecting the "P" wave (compression wave) of an earthquake, which travels faster than the more destructive "S" wave (shear wave). -The earthquake detector saves valuable seconds by removing the guesswork in earthquake detection. -It is capable of detecting large earthquakes that occur hundreds of miles away and can detect moderate to minor earthquakes for many miles around your local area. Instructions: 1. Remove the battery board, determine the positive and negative polarity of the battery, put in a 9V laminated battery, and move into the battery cover. 2. Turn the switch to "ON", the indicator light flashes, and it enters the alert state within 15 seconds. 3. When the alarm is subject to vibration, shock and movement, it will emit an alarm sound of 120 dB, and the alarm time will be about 20 seconds. 4. When the alarm sound is obviously reduced, please replace the battery, please remove the battery for a long time.