For a list of all currently documented Ralink chipsets with specifications, see Ralink.
Manuf/OEM/ODM Alpha Networks WUS-N02
FCC approval date: 17 July 2007
UPC: 658729081482 (UPC DB, On eBay)
Country of manuf.: China
Connector: Male A
Form factor tags: dongle
"8WUSN02..0B1G" appears to be silkscreened on the board in the FCC photos.