Size:1 pack  | Style:Photoelectric Technology Product Description The First Alert SC7010B Hardwired Combination Photoelectric Smoke and Carbon Monoxide Alarm with Battery Backup delivers both smoke and carbon monoxide detection in a single unit. Equipped with a photoelectric sensor and Optipath 360 technology, the alarm detects smoke produced by smoldering fires while keeping false alarms .... BRK Electronics AC Smoke and Carbon Monoxide Combo with 10 year 9V Lithium Battery. ... First Alert 120V AC Photo Smoke Detector With 9V Battery. Part # B7010B | Item # 2341455 | Mfr. Part # 7010B. Size: 120VAC. ... Kidde Firex Firex Hardwired Smoke Alarm with Hush. Part # K21007581 | Item # 4473731 | Mfr. Part # 21007581. Size: X. POINTS. $18.99. "/>First alert brk 7010b hardwired smoke