Casio WU-BT10 Wireless Bluetooth MIDI and Audio Adapter for Select Casio KeyboardsThe Casio WU BT10 is a Bluetooth MIDI and audio adapter that connects to your keyboard's USB Type A port and gives your instrument the ability to send and receive MIDI data wirelessly to and from other Bluetooth MIDI compatible gear. It also allows you to play Bluetooth audio on your keyboard's built in speaker system. The WU BT10 does not require additional batteries or a separate AC adapter, instead it draws power from the host keyboard's USB port.