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First Alert CO511B

By: Carl Laron on March 14, 2018

Bottom Line For maximum protection, experts recommend interconnected CO detectors such as the First Alert CO511B. This CO alarm is battery powered and uses secure radio links to communicate with other First Alert wireless alarms. It's judged to be excellent in detecting dangerous carbon monoxide levels.
  • Can be interconnected with other First Alert alarms
  • Wireless operation
  • Voice alerts
  • None noted in reviews