Casio WU-BT10 Wireless Bluetooth MIDI/Audio Adapter for CT-S400, CT-S410 and LK-S450

The WU-BT10 Bluetooth MIDI and Audio adapter connects to your keyboard's USB type A port, and can send and receive MIDI data to and from other Bluetooth MIDI-compatible gear. It also receives and plays Bluetooth audio using your keyboard's built-in speaker system. The WU-BT10 is powered by the host keyboard's USB port, and does not require additional batteries or a separate AC adapter.