Easy Installation - simply plug-in to a standard, 120V outlet in your home
9-volt battery backup provides protection during a power outage
Digital LED display shows the level of carbon monoxide the CO alarm is sensing or states "GAS" when explosive gas is present
85-decibel alarm announces when carbon monoxide or explosive gas is detected
Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested
Test-Hush Button makes testing the detector or silencing false alarms easy
Extension cord (included) allows for placement on a table or shelf
UL Listed with a lifespan of 7 years and a 5-year limited warranty which begins when the alarm is powered on, if that date is unknown it should be assumed the alarm should be replaced.