Bluetooth USB adapter lets you use the AR-48c Ring Controller wirelessly during live performances. Use the Ring for wireless control of all your MIDI instruments and devices connected to your computer - samplers, synths, and drum machines, as well as MIDI-enabled effects processors. The BTA-1 can also be used with the LiveTrak L-20. It offers wireless control via a free iOS mobile app featuring most onboard functions, including Fader Levels and Modes, Scenes, EQ, EFX sends, returns, parameters, and more.