*Replaces Model# 900-CUDR and 900-0102*30CUDR - COMBO SMOKE + CO ALARM, AA BATTERY POWERED. This alarm offers a modern 5" design ideal for all living spaces. Cutting edge technology sends fast alerts that give your family more time to get out safely and enhanced sensing technology reduces false alarms often caused by cooking.*2 AA Replaceable Batteries: Provide power even during short-term power outages for extra peace of mind.*Double the Detection: Alerts you to both smoke & carbon monoxide (CO) using a single, cost-effective device.*Enjoy Simple Installation: With included twist-and-click mounting bracket.