UTC FIRE & SECURITY 449CSRT SMOKE DET SELF-DIAG PHOTO 4-WIRE 12 24V HT RLY SNDR Review
The ESL 449/448 Series self-diagnostic, four-wire smoke detectorscontinually monitor their own sensitivity and operational status, andprovide a visual trouble indication if they drift out of sensitivity rangeor fail internal diagnostics. Read more...
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