SENTINEL CARBON MONOXIDE ALARM 3 AA BATTERY OPERATED

This unit is a battery operated carbon monoxide alarm that utilizes sophisticated electronic components to protect you and your family from dangers of carbon monoxide. This unit includes a slide-out battery door that gives immediate access to the batteries and a safety feature that makes it difficult to close the door without the batteries being installed. Inside cover of battery door features quick reference guide for what to do in case of an alarm and has a 5 year limited warranty. 3 AA Battery operated.