How can I switch between Spotify streaming and offline music playback?

To switch between Wi-Fi, Bluetooth®, and offline music playback via a microSD card, press the button on the bottom of the wobie box. The LED color indicates which connection type is active:

White LED = Wi-Fi → Blue LED = Bluetooth → Yellow LED = Offline playback → …

Note that the button is hidden behind a silicone tab (IPX5 protection). You'll need to use some force to access the ports.