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Imagine lifting a lid to a secret room, then all hell breaks loose. The Spy Mercury Switch will detect an angular movement greater than 10 degrees. It works just like a spirit level:, tilt the spirit level and the bubble moves. In this case, you tilt something and the mercury 'bubble' slides across the switch contacts, activating something. This is a great sensor. We have great fun fitting it to a briefcase and then asking passers-by to steal it. What they don't know, is that we have also fitted it with Spy Box. Imaging taking a case and you can hear the phone going off...It works. Key Benefits
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