Ranked 1st in our list of recommended combination smoke & carbon monoxide detectors and sells for $40.14 (as of 10/12/2022 02:45 PST details ) , more than 78% of the First Alert SCO500 reviews are positive. With features such as wireless enabled battery operated combination smoke and carbon monoxide alarm and interconnects with other first alert enabled alarms to create a wireless safety network, it is indeed our top pick among combination smoke & carbon monoxide detectors.