How to switch between the three audio channels on the Xiaomi Desktop Speaker?

The Xiaomi Desktop Speaker supports three audio channels, including the USB channel, the Bluetooth channel, and the AUX IN channel.
To switch between the three audio channels, please refer to the following information:
1. Press the Action Button twice to cycle through the channels in this order: USB channel (default channel when powered on), Bluetooth channel, AUX IN channel. A prompt sound will indicate the successful switch;
2. The speaker supports remembering the last used channel before shutting down. If the last channel is USB/AUX IN and no same signal is detected upon power-up, it will automatically switch to the Bluetooth/USB channel;
3. Press and hold the Action Button for 2 seconds in any non-Bluetooth channel, and the speaker will be forced to switch to the Bluetooth channel and enter Bluetooth pairing mode;
4. If no 3.5mm audio jack is inserted into the AUX IN port, only the Bluetooth channel and USB channel are available. When a 3.5mm audio jack is inserted, it automatically switches to the AUX IN channel with a prompt sound.