PowerTRC Desktop LED Programmable Message Fan W/custom Drawing - USB Powered (Green Led) Program up to 8 messages and 26 letters in each message. Program direction of how message open and close. 16" Flexible Goose Neck and can power from any USB outlet. Software works only with Microsoft Win 95/98/ME/2K/XP/Vista/ 7 / 8 OS. ON/OFF Button & Soft Blades for Safety. By Power TRC.