How do I switch between Spotify streaming and offline playback?

Press the button on the underside of the wobie box to switch between Wi-Fi, Bluetooth® and offline playback from a microSD card. The LED shows which mode is active:

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

The button is behind a silicone flap (IPX5 protection). You'll need to pull the flap back to reach the ports.