Large LED DisplayTo conserve energy, the display will light up when there is sound or action, but not at other times.To keep the light on, please always plug it in. Our alarm clock features a 5.6inch large LED mirror display making it easy to read; one of the best alarm clocks for bedrooms due to its simplicity, this premium digital clock is something you'll enjoy waking up to every morningUSB Powered and Built-in Backup Batterywe've already included a charging USB cable our smart clock for your convenience for powering, A built-in button battery for saving your clock-settings in case of power outages; Time display support both 12hrs and 24 hrs formatDual Alarms with SnoozeDual alarms make it possible to set two separate wake-up times. Snooze time can be set, do not need manually to turn off the alarm clock. Wake you at different times, make your life easy and more convenientAdjustable Brightness4 Levels Adjustable Brightness. LED Large Digital Display, Clear and Comfortable Visual Sense, it will auto dim during 10:00pm-6:00am. When plugged with USB cable, the LED light will be on always. By pressing the button of "SNOOZELIGHT" the display can keep lighting for 5 secondsStylish and Simple DesignSize:14.56.53.2 CM (5.72.561.26Inch), Stylish and simple mini mirror alarm clock can decorate your bedroom, living room, but also can be used as a mirror when needed.