Unifire&reg; LED Programmable Message Fan W/custom Drawing - USB Powered Software works only with Microsoft Win 95/98/ME/2K/XP/Vista/ 7 / 8 OS. Portable Mini USB Fan LED Cooling Cooler Fans Programmable for laptop desktop Program direction of how message open and close. 16" Flexible Goose Neck and can power from any USB outlet Program up to 8 messages and 26 letters in each message.