Pesp Romantic Luminous LED Fluorescent Message Board LCD Calendar Digital Electronic Alarm Clock Night Light (Blue) The big screen digital clock display.(The date, time, temperature are switchable and magic lamp broadcast show.) It can supply by USB charging port or three AAA batteries.(not include)(Light will be on all the time if it is powered by USB; Or it will be off after 10 seconds by battery) It has 12 hours or 24 hours format choice, degrees Celsius or Fahrenheit can be chosen,and it has Three groups of alarm clock and Snooze function. Matching fluorescent pencil,you can writing and drawed on the LED light message board.(you can use the tissue or wet cloth to clean for recycled use. ) With 4 USB port,you can charge other device by it.