Features: Fluorescent light message board, allows you to write messages, draw pictures. Date, time, temperature switchable or slide show. 12H/ 24H format, Celsius(C )/ Fahrenheit(F) is optional. 3 groups of alarm and snooze function. Birthday celebration. Timing and count down function. 16 world famous songs to appreciate. 2000 to 2099 calendar. Powered by 3 * AAA batteries (batteries are not included), or through USB port. 4 USB ports ( Usb2.0 protocol). Blue background light. Note: Light will be on all the time if it is powered by DC 5V (Usb); otherwise it will be off after 10 seconds.