First Alert BRK SC7010BV Hardwired Talking Photoelectric Smoke and Carbon Monoxide (CO) Detector Keep your family safe with this talking hardwired smoke and carbon monoxide alarm; it's equipped with voice and location, so you are alerted of the danger and where it originates from across your house Tells you whether the danger is smoke or carbon monoxide and where the threat is among up to 11 pre-programmed locations in your home Features electrochemical Carbon Monoxide sensing technology and photoelectric smoke sensor optimized to detect larger smoke particles produced by smoldering fires; helps minimize the number of false alarms Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected 10-year limited warranty; equipped with end-of-life signal chirp, so you know when it's time to replace the unit for your safety Rigorously tested to meet UL standards