Universal Security CD-9775 - 9-Volt battery operated combination ionization smoke alarm and carbon monoxide alarm, battery drawer, silence featureCombines separate sensors to detect smoke or carbon monoxideSilence feature - convenient silence button with automatic reset allows you to temporarily override an alarm - ideal for cooking smoke and fireplaces and eliminating nuisance alarmsThe quick-draw pull-out drawer makes battery replacement easyThis unit includes 3 LED alarm condition indicators and is equipped with a loud 85 dB horn alarmFast and easy installation