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[SKU-360707]Detects low and ultra-low frequency vibration and sounds a piercing 110 dB alarm when tripped. Very simple to use: ON/OFF switch to activate the unit. Includes an internal magnet for easy mounting on a steel surface. Can be used vertically or horizontally.Great for alerting you to the presence of movement, vibration, bumping or thumping in the night. Can also be used as an anti-theft alarm or Earthquake alarm. Very sensitive! Powered by 1 x 9V battery (not included).