LARGE DISPLAY -- 6.2 inches large LED screen with large numbers make it very easy to read the time. You can also use our led clock as a mirror, its operation is very simple. DUAL USB PORT -- 2 USB charging ports can simultaneously charge two devices. SBackup battery (included) only stores time and alarms' settings. Tips: This clock can only be used when powered by USB powered. SNOOZE FUNCTION -- Big snooze button helps you to easily turn off the buzzer without opening eyes, and get extra 5-60 minutes sleep. Is your essential artifact. ADJUSTABLE BRIGHTNESS -- The mirror digital clock provides 3-level brightness,adjust by manual or auto to a comfortable brightness. Very convenient to use. NIGHT MODE -- The quiet and silent clock allows you to get rid of the hustle and bustle of the night and fall asleep peacefully. At night the mirror alarm clock will automatically enter the lowest brightness state to prevent affecting your sleep quality.