First Alert SC5 Hardwire Smart Smoke & CO Alarm vs X-Sense WiFi Smoke & CO Detector

Both alarms cover the same two hazards, smoke and carbon monoxide, so price, display and power source decide it: the X-Sense WiFi Smoke & CO Detector prevails overall with a friendlier price, higher owner rating, an LCD status screen and a built-in light, none of which the First Alert SC5 Hardwire Smart Smoke & CO Alarm offers. The SC5 Hardwire answers with mains power backed by a battery rather than running solely on a replaceable cell, a warranty twice as long (10 years versus 5), and steam-check tuning to cut cooking and shower false alarms, plus its Google Home integration where the X-Sense unit has none. If existing alarm wiring and Google Home alerts matter most, the First Alert SC5 Hardwire Smart Smoke & CO Alarm is the safer long-term investment, while anyone without wiring who wants an affordable, screen-equipped combo detector should pick the X-Sense WiFi Smoke & CO Detector.