Reddit reviews First Alert Smoke Detector and Carbon Monoxide Detector Alarm with Built-In 10-Year Battery, BRK PRC710

Complies with all current 10 year legislation in U. S. states/cities where requiredFeatures 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 alarmsA loud 85 decibel alarm sounds when Carbon Monoxide, and Smoke levels begin to riseFeatures a sleek, low profile design to blend more fully into the wall and out of sight10-year limited ; equipped with end-of-life signal chirp, so you know when it’s time to replace the unit for your safety (the date printed on the item is the manufacturing date, not the expiration date)Rigorously tested to meet UL standardsFaster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safetyFirst Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)