First Alert Smoke Alarm-Carbon Monoxide Alarm Combo Pack $18.97
at lowes: http://www.lowes.com/pd_349222-347-SCO403-3_4294779153_42949370
Smoke Alarm-Carbon Monoxide Alarm Combo Pack
9V battery-operated smoke alarm
Battery-powered carbon-monoxide detector uses an electrochemical sensor
which is the most accurate technology available for detecting carbon
monoxide (compared to other common sensing technologies)
Easy-access battery door on both alarms, no need to remove alarm from
ceiling to change battery
Test buttons help ensure alarms are working properly
5-year limited warranty
