The First Alert Onelink SCO501CN gives protection from smoky fires as well as dangerous CO. Although it costs more than the Kidde Battery Operated Combination Carbon Monoxide and Smoke Alarm KN-COSM-B (Est. $35), it interconnects with other Onelink models to provide continuous home protection. It operates on two AA batteries, so it doesn't require professional installation like hardwired models. The voice alert, which follows the sound of its standard horn, can be programmed to announce the location of the danger based on where the detector is located. An internal timer tracks the CO sensor's lifespan and gives an alert when the six years are up.
We found ConsumerReports.org offers the most comprehensive expert review of carbon monoxide detectors. In September 2009, editors compared the First Alert Onelink with nine other models. It's also included in a lengthy comparison chart of lifesaving features at AlarmSpecs.com. Additionally, nearly 50 owners post opinions about this detector at Amazon.com.
ConsumerReports.org editors rank the First Alert Onelink SCO501CN among four interconnected models and six stand-alone models. They conduct thorough testing for response time to high and low CO levels as well as features like voice alerts.
Review: CO and Smoke Alarms, Editors of Consumer Reports.org, September 2009
Nearly 50 owners give the First Alert Onelink SCO501CN an average rating of 4.1 stars out of 5. Owners say it's reliable and applaud the voice alert that can be programmed to announce the location of the danger. A few reviews report problems with closing the door to the battery compartment.
Review: First Alert CO615 Carbon Monoxide Plug-In Alarm with Battery Backup and Digital Display, Contributors to Amazon.com
This website rates nearly 200 models of carbon monoxide, heat and smoke detectors based on lifesaving features. The First Alert Onelink SCO501CN falls in the second tier of ratings.
Review: Alarm Specification Comparison, Editors of AlarmSpecs.com