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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).
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