First Alert 2-Pack Battery-Operated Carbon Monoxide Detector

These battery operated carbon monoxide alarms use an electrochemical sensor the most accurate technology available. The test/silence button silences the alarm and allows you to test its functionality. The unit monitors and alarms if carbon monoxide levels become dangerous. No installation is required and the attractive design allows the unit to be placed anywhere you need it. It includes an optional wall mount with no outlet required. An audible and visual battery signal alerts you to replace the battery. Pull down action chart has convenient guide on what to do if an alarm sounds.