1# Without USB PORT!!!2# With 4 USB PORT Digital clock has a LED light message board with a highlighter. You can write any words on the board what you like. At night， you can read the words on the LED luminous screen board. You can switch the time， date， temperature or display model. There are 12 hours or 24 hours format selection， degrees Celsius or Fahrenheit option and three regular alarm clock and snooze function. When you are outside， you can also leave a message on the board to your family. Or you can set at some points of one day to ring automatically happy birthday song.Screen:LED displayPower Supply:3*AAA Battery(Not included)Clock size:10.5 x 6.5 x 5cm/4.1 x 2.56 x 1.97inchBoard size:14 x 9.8cm / 5.5 x 3.8inch