For a list of all currently documented Ralink chipsets with specifications, see Ralink.
"GCBWLARL V1P0" and "2991S017-010009" is silkscreened on the board in the FCC photos.
~15-~17 dBm (CCK)
~10-~13 dBm (OFDM)
< -84 dBm @ 11Mbps (PER < 0.08)
< -70 dBm @ 54Mbps (PER < 0.08)