This 2030-DSR Kidde Optical Smoke Alarm is a battery-operated, standalone smoke alarm that uses an optical sensor. This Kidde smoke alarm is easy to install and can be used almost anywhere in the home such as in living rooms, hallways, bedrooms and landings, with a 9V replaceable alkaline battery and fixings included. This battery-powered smoke alarm is for standalone use only and includes a ‘hush’ control feature that allows nuisance alarms caused by cooking or steam to be temporarily silenced.