First Alert Carbon Monoxide Alarm - Battery Operated

The First Alert CO400B carbon monoxide alarm uses an electrochemical carbon monoxide sensor-the most accurate technology available. It is powered by a 9V replaceable battery giving you peace of mind even during power outages. The test/silence button both silences the alarm and allows you to test its functionality. The unit monitors and re-alarms if carbon monoxide levels persist sounding a loud 85-decibel horn. 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 low battery signal alerts you to replace the battery. Pull down action chart has convenient guide on what to do if an alarm sounds. 7 year limited warranty. UL listed.