First Alert BRK SC7010BV-12 Hardwired Talking Photoelectric Smoke and Carbon Monoxide (CO) Detector, 12 PackBrand: First Alert Features: Keep your family safe with this 12 pack of talking hardwired smoke and carbon monoxide alarms; they're 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