For a list of all currently documented Ralink chipsets with specifications, see Ralink.
Guillemot Hercules HWGUSB2-54
Connector: Male A
Form factor tags: dongle
Product page, Drivers
Amigo FCC documents suggest the device may be the Amigo AWU-902W, Amigo AWU-902T, or both in some manner of fashion.
The ID appears to be 06f8:e000 (lsusb dump, ndiswrapper wiki, another lsusb dump).