menu or go to Settings->Mode choose menu to enter the USB DAC mode.
3) Connect the M21 to the computer by the USB port. Select the M21 as the
audio input both in the computer and the music app, so it can work.
Notes:
When in the USB DAC mode, the M21 does not support Bluetooth transmitting.
7. How to use the M21 as a Bluetooth transmitter?
It is similar to mobile phone's. Here are the instructions.
1) Go to the Settings->Bluetooth menu to turn on the Bluetooth function.
2) Make the Bluetooth receiving device, such as Bluetooth earphones, enter the
pairing state. (Please refer to the user manual of the Bluetooth receiving device
about how to enter the pairing state.)
3) Go to the Bluetooth device list of the M21->Pair new device to complete the
connection.
What can be done if the M21 fails to connect to Bluetooth earphones?
If it fails to connect to Bluetooth earphones for the first time, please make sure
the earphones are in the pairing state (the connection will fail if the earphones
are in reconnecting state for the first-time connection). Go to the Bluetooth
menu of the M21 to start the connection.