The USB identifier VID_0FE6&PID_9900 is a classic example of the "long tail" of consumer electronics: a ubiquitous, low-cost chipset whose driver support is an afterthought. By now, you should understand:
The ampersand ( & ) and underscore ( _ ) are formatting conventions used by Windows operating systems to denote the hardware ID string. usb vid-0fe6 amp-pid-9900