Buffalo WLI-UC-G450

Product page

"2976400701" is silkscreened on the board in the FCC photos.
 * The device uses a single-chip Ralink IC, probably RT3573.

Drivers

 * Driver on wireless-driver.com
 * Driver on Buffalo's US site (in a 269MB zip file, includes Win8 driver though)

Vendors

 * On Newegg