Edwards Signaling SD-4WPCBT PCB/Sensor KitEdwards SuperDuct smoke detectors are the most advanced and most reliable devices in their class. Designed for easy installation and superb reliability, SuperDuct represents the perfect balance of practical design and advanced technology. Reliability and stability are two features built into every SuperDuct detector. SuperDuct features environmental compensation with patented differential sensing. This achieves a level of stability and reliability
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