For a list of all currently documented Ralink chipsets with specifications, see Ralink.
Connector: Male A
Form factor tags: micro dongle (w/ large antenna)
4.2dBi integral omni-directional antenna
Product Page, Downloads
Drivers are available on the Ralink corp. website.
The FCC ID entry shows the device with a RT5370, conflicting with this entry. There may be W311Ma units with both chips (unknown).