Large LED ScreenLarge Screen: 265mm x 70mm (10.4in x 2.7in), you can read the real time from a long distance. This electronic LED alarm clock has temperature (C/F), date, time (12/24 hours), 2 alarms. Sizes for you to choose! The USB desk clock will only work when connected to a power source. A built-in coin cell battery backs up the clock settings in the event of a power failure. Wall ClockThe light alarm clock has a notch on the back, which can be easily hung on the wall as a wall clock or placed on the table at will. An elegant and simple alarm clock can decorate your living room bedroom and can also be used as a mirror when needed. Auto DimmingThe digital clock can be connected via USB cable, and the brightness can be automatically adjusted over time, or manually adjusted to set 5 brightness levels, 3 auto levels, or turn off the brightness. A digital clock with lights that won't obstruct the night, perfect for heavy sleepers.