Size and design - 16 x 2.5 x 6 cm; stylish and simple alarm clock that can decorate a bedroom or living room. Display and illumination - 7.6 cm LED display with a clear readout; automatic operation between 10:00 and 6:00. - When powered by USB, the LED backlight lights up. Press the Snoozelight button to illuminate the display for 5 seconds. Quiet operation - Unlike a ticking mechanical alarm clock, this clock is quiet, helping you sleep undisturbed. Power options and battery backup - Plug in a USB power supply (not included) or insert three AAA batteries. - In battery backup, the screen goes black but the alarm and time settings remain and the alarm will sound. - When using batteries, the voice feature can be activated, and the display can be turned on by clapping your hands; it will automatically turn off after 16 seconds.