GE Security 429CRT Self-Diagnostic Photoelectric 2-Wire Smoke Detector w/Heat Sensor and Auxiliary Relay, 12/24VDC. Integral 135 F Fixed Temperature/
The 400 Series self-diagnostic, 2 and 4 wire smoke detectors continually monitor their own sensitivity and operational status, and provide a visual trouble indication if they drift out of sensitivity range or fail internal diagnostics.
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