Small Digital Alarm Clock with Brightness Dimmer: Measuring 5.9*3.11*1.65 inches, this compact alarm clock fits perfectly on your bedside, desk, or nightstand. It features a large LED display with 5 adjustable brightness levels plus OFF, allowing you to customize the brightness for clear visibility or a dim setting for better sleep. Plug-In Clock with Batter Backup: Powered by an adapter, this electric clock includes a battery backup to save your settings during power outages. Simply insert 3 AAA batteries (not included) for memory backup, ensuring your routine stays uninterrupted. Note: Adapter is needed to keep the clock working. Batteries are for memory backup only.