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The GR2721 uses reliable solid state sensing methods to monitor entires to high security locations. It has been tested to one of the highest security specifications, UL 634 Level 2. With solid state technology there are no moving parts, so the switch can reliably operate for millions of operations. The GR2721 includes pry and magnetic tampering protection. It is immune to shock and vibration that cause false alarms on other switch types. It is also resistant to lightning, static shock and radio frequencies.
