The SigmaGard operates on Digital Radio Frequency Identification. This means it’s virtually interference free. Analog systems are vulnerable to false alarms resulting from interference from elevators and automatic door openers.
These systems can be built with three different components allowing SMD to customize a system based on your resident population, your physical plant, and your budget. Exterior keypads and/or push buttons may be interfaced with door locking units to provide access control.
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