The Bluetooth indicator on the Bluetooth® Audio MIDI Dual Adaptor (BT-DUAL) lights up when the TD-02 and a mobile device are connected via Bluetooth® audio. To use the TD-02 with an app that supports Bluetooth MIDI, make the necessary settings in the app and then connect to “TD-02 MIDI”.
Example of settings for GarageBand: Use a Bluetooth MIDI device with GarageBand for iPhone