11-inch large digital clock shows you clear image of time, date, day of week, and indoor temperature in large numbers. 4 levels of brightness can be adjusted for Off/ Dim/ Bright/ High Light. No matter in dark environment, or bright area, this digital alarm clock can tell you what time it is at any time.
Internal backup battery is set for saving your clock settings in case of power outage, but not supply power for the clock. In daily using, the included AC adapter is required for using the clock.