This ultra-stylish minimalistic mirror display alarm clock is perfect for your everyday needs! Dimension: 16 x 6 x 2.5 (cm), 1m USB cable is included, AAA batteries are NOT included User manual is included. Features - Large Digital Display - 16cm LED Digital Display. It will auto-dim between 10:00 pm and 6:00 am. When plugged with the USB cable (included), the LED light will be on always. By pressing the "LIGHT/SNOOZE" button at the back, it will keep the display lighting on for 5 seconds. Quiet Movement - Silent movement to ensure a quiet night's sleep. AC Electric Powered & Batteries as Back-Up - Insert the USB power cord (included) into any USB adapter or insert three AAA batteries (not included) to charge the clock. When the clock is powered by batteries, the screen will go black but the alarm and time settings will remain, and it will still alarm when it reaches the set time. When it is using the USB cable, the display can be turned on by clapping your hands, and the screen will automatically go out after 16s. Snooze - Snooze time can be set, do not need manually to turn off the alarm clock, which makes your life easy and more convenient. Three brightness levels - You can adjust the brightness levels by pressing the "UP" button at the back Multi-Display - You can use 12/24 hour time, it also has date month display and temperature/0F. Two designs are available: Black mirror and white mirror. Designs are selected randomly.