Space-saving (5.6" x 1.9" x 2.9") size with large white LED numbers easy to read day or night; AC powered, come with 59 inch power adapter. Easy snooze with a simple press of anywhere on the top. Easy-to-use digital alarm clock. Even no need instructions to operate it. Get your personal comfort brightness with 0-100% dimmer slider, and enjoy a fresh morning with adjustable alarm volume from 30-85db. Outlet Powered: Plug in to power the clock with the included DC adapter. Memory time and alarm settings by 2*AAA batteries(not included) No need reset the time once main power returns.