BRK SC9120B Smoke and Carbon Monoxide Combination Alarms Lot of 8 by BRK at SS Security Group. MPN: SC9120B. Hurry! Limited time offer. Offer valid only while supplies last. SC9120B - 120V AC/DC Smoke/CO Combo Alarm - Hardwired ionization/CO combination alarm meets new construction requirements. 10 year CO Sensor/10 year End of Life. Electrochemical Carbon Monoxide Sensor - the most accurate sensor available as compared to other sensing technologies. 9V Alkaline Battery Backup. Latching alarm indicator - remembers which unit initiated an alarm. Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance
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