Designed to block garage doors, hangars, railway containers, telephone cabinets and other structural magnetically conductive (metal) and magnetically non-conductive (aluminium, wood, etc.) elements of buildings and structures to open or displacement with the issuance of alarm notification by opening or closing reed contacts to the loop of the receiving and control device. The housing is metal, non-disassembling.
Metal protective corrugated sleeve. Vandal-proof.
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