FIELD: security alarm. SUBSTANCE: device has switch which is located inside monitored object and has spring contacts. In addition device has insulation key, skewing rollers and stationary anchor to which one end of insulation key is attached. Insulation key is designed as elastic ribbon which runs through hole in wall of monitored object through skewing rollers. Said ribbon is located between spring contacts of switch. EFFECT: increased functional capabilities. 1 dwg
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