I have the same device it seems. (See picture) Picked it up from a 'Cheap' show (I have a stronger words name, but you can't beat the prices.).. It's based on the RaLink RT-5370, according to both my UBUNTU based laptop & my (I feel so soiled!) Windows-7 based laptop. Ironic, the UBUNTU distro I use (Ultimate Edition V3.5 X64) has the driver built-in.. first couple of times trying it with the Pi, failed.. (not recognized.) I'll have to re-check. Getting ready to fire it off, and see if it recognizes the network now.
And.... It's talking! A little extra steps more than I'm used to in setting up a network adapter, but it's talking with the most recent Raspbian. (with most of the updates applied).