X-Sense AC Hardwired Combination Smoke and Carbon Monoxide Detector, Hardwired Interconnected Smoke and CO Detector Alarm with Replaceable Battery Backup, XP06, 3-PackBrand: X Sense Color: White Features: 10 Year Product Life: This combination smoke and carbon monoxide detector features high quality sensors and components which are built to last 10 years, protecting your home for a decade; it is hardwired into your home's power with a 9 V battery backup Detects Both Smoke and CO: The X Sense detector features a photoelectric smoke sensor that detects smoke from slow burning fires, as well as an electrochemical CO