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| Tools & Home Improvement > Safety & Security > Fire Safety > Smoke Alarms |
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| Product Description The 521 Series continually monitor their own sensitivity and operational status, and provide a visual and remote trouble condition if they drift out of the sensitivity range or fail internal diagnostics. This meets NFPA 72 field sensitivity testing requirements without the need for external meters.The 521 Series self-diagnostic, two-wire smoke detectors are the industry's first conventional direct-wire smoke detectors with analog features such as remote maintenance/trouble reporting (CleanMe), drift compensation, and multi-criteria detection. GE SECURITY 521NCSXT Photoelectric 2-Wire Smoke Detector Shipping Weight: 1 pounds | ||||||||
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