The Daewoo Optical Smoke Alarm uses advanced optical technology to quickly detect the presence of smoke, providing an early warning in the event of a fire. It's easy to install and reliable, giving you peace of mind as it safeguards your loved ones and property. The device measures 101mm in diameter and 34mm in depth, and it requires a single 9V battery, which is included. The smoke alarm also features a low battery warning and a flashing red alarm indicator. It comes supplied with wall plugs and screws for easy installation.