First Alert Standard Battery-Operated Smoke Alarm and CO Alarm Value 2 Pack with Models SMI100 and CO400 , 1046718

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency Provides early warning to help you and your loved ones safely escape Alarm sound levels: 85 dB at 10 ft. Both are battery operated, easy to install, have convenient test/silence buttons, front-access battery doors for easy battery replacement, and will work in the event of a power outage Smoke alarm features Precision Detection advanced-sensing technology; reduces nuisance alarms and detects smoke from synthetic materials which burn hotter and faster for less time to safely escape CO alarm also has end-of-life unit warning so you know when to replace the alarm all together Includes mounting bracket, installation screws, and two 9-volt batteries Battery-operated alarm allows for easy installation and maintenance Easy Access Battery Compartment, End-of-Life Warning, Precision Detection