5.Introduction of the three working modes of RETRO NANO

Switch working modes: Double press the multifunction button
1. PC mode: Double press the multifunction button to switch to the PC mode. At this time, the RETRO NANO is in PC mode, which can be powered and charged through USB.

2. BT mode: Double press the multifunction button to switch to the BT mode. At this time, the RETRO NANO is in Bluetooth receiving mode, which can be powered and charged through USB.

3. PHONE mode: Double press the multifunction button to switch to the PHONE mode. At this time, the RETRO NANO is in mobile phone decoding mode, which will be disabled from USB charging (it will be forced to charge if it is powered off for low battery).
Note: If the “RETRO NANO”is not placed with a battery, it still works when connecting to a USB.