Never be late again with Light Up Blue Cube Alarm Clock! With a simplistic yet elegant bamboo wood appearance, Light Up Digital Clock is great for office or home use and blends beautifully with other decors. A useful and amazing gift for the Holidays, Birthdays, or even Employee Recognition. To activate your user-friendly LED Wooden Clock, plug into a USB port (cable provided and recommended if using daily). Alternatively, you can use 3 AAA batteries for when USB capabilities are not available (batteries sold separately). Instructions: Hold down SET button to enter Setting Mode, where you can modify: Year Date Time Format (12-Hour or 24-Hour) Time (Hour & Minutes) Alarms Press SET button to choose display functions: Mode 1 - Cycles through Time, Date, and Temperature Mode 2 - Displays only the Time Hold down UP button to adjust LED brightness: LO - Dimmest setting L3 - Brightest setting Press UP button to select Temperature format. Press DOWN button to choose sleep mode ON/OFF.