FIELD: physics; alarm.
SUBSTANCE: invention relates to alarms, specifically to trespass alarms. The alarm device has posts along the perimetre of the guarded object, between which there is a row of strings connected to the alarm block. According to the invention, a string in the said row has n1 sections with k1 segments with a curvilinear or straight line profile in the first plane, n2 sections with k2 segments with a curvilinear or straight line profile in the second plane.
EFFECT: increased reliability of the alarm device.
13 cl, 10 dwg
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