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).