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2-wire smoke detectors are hardwired smoke detectors that detect the early signs of smoke or fire using the zone wiring of the home or business fire alarm system.  These devices are usually restricted to a hardwired zone and uses a single pair of wires to combine detection and power loops. In other words, the wires can carry signals when smoke is detected as well as power the detector, which reduces and accelerates installation time. If the  alarm is cleared, the device is automatically programmed to reset the zone.  At JMAC, we carry a wide selection of 2-wire smoke detectors by System Sensor, UTC Interlogix and more. To learn more about these two wire smoke detectors, and how they can fit into your alarm security project, dial our security specialists at 516-812-0917.