The Casio WU-BT10 Bluetooth MIDI and audio adapter is connected to the USB Type-A port of your keyboard and can send and receive MIDI data to and from other Bluetooth MIDI-compatible devices. It also receives Bluetooth audio and plays it through your keyboard's built-in speaker system. The WU-BT10 is powered by the USB port of the host keyboard and does not require additional batteries or a separate power supply.