LED display card operation instructions: 1) Press "K1" to turn on the LED display card, it will displays "AAA" 2) Press "K2" to choose the group (there are 6 groups altogether, among which the 1st group can store 512 characters, 5 other groups can store 256 characters), after you choose the group, confirm according to "K1" 3) Press "K4" to choose the character form you want to display. (There are capital letter, small letter and special character for you to choose, please see the blank as below) 4) After choosing the character form, you can press the "K2" or "K3" to choose the letter or the special character you want to display. Confirm according to "K1" after selecting a letter or the symbol each time. After you press the "K1", you find that the letter you choose is wrong, then you can press "K5" to correct it. That is, first press "K5", then press "K4" to choose the character form you want to display, after that press the "K2" or "K3" to choose the letter or the special character you want to display. Confirm according to "K1" after selecting a letter or the symbol. After the correction you can continue to input what you want 5) Waiting for 10 seconds, it will show automatically after all choosing the display information wanted