PowerTRC Programmable Message Fan with Customized Drawing-USB Powered-(Red Led) Program up to 8 messages and 26 letters in each message and use as USB Mini Desktop Fans 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