... .usb mini programmable led sign 2.4 grade brightness & 6 speed adjust ... world3.Support Windows7/XP,Vista systerm4.Programmable LED Signs, Display Ability: English 8000 Chars, East Asia 4000 Chars, ... 100%) by the button on the side.7.8 display actions:hold, snow, move from left, move from right ... from PC and re-charge the battery18.can display by upright or stand upside down19.support the function ...