Photo 1 of Honeywell Home RTH221B 1-Week Programmable Thermostat and First Alert Battery Powered Alarm SCO5CN Combination Smoke and CO Detector Thermostat + Smoke and CO Detector

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Photo 1 of Honeywell Home RTH221B 1-Week Programmable Thermostat and First Alert Battery Powered Alarm SCO5CN Combination Smoke and CO Detector Thermostat + Smoke and CO DetectorPhoto 2 of Honeywell Home RTH221B 1-Week Programmable Thermostat and First Alert Battery Powered Alarm SCO5CN Combination Smoke and CO Detector Thermostat + Smoke and CO DetectorPhoto 3 of Honeywell Home RTH221B 1-Week Programmable Thermostat and First Alert Battery Powered Alarm SCO5CN Combination Smoke and CO Detector Thermostat + Smoke and CO Detector