3. Buttons and ports instruction of M33 R2R

What are the differences between the two USB ports at the bottom of the M33 R2R?

The port marked "USB3.0 supports" functions such as data transfer/charging, USB HOST, and USB OTG.

The port marked "POWER IN" only supports charging/power supply and cannot be used to transfer data to a computer.

Note: Both USB ports support fast charging, while other types are recognized as normal charging.

How to use the multifunction button?

1.In Player mode: Add to Favorites (default option), Switch song randomly, Play/Pause, Delete currently playing song, Switch equalizer, Enter USB DAC Mode, Enter Bluetooth Receiving Mode, Lock screen/Wake up, Enter Cassette mode, Open dropdown menu, Swwitch personalized sound,No function specified

2.In Bluetooth Receiving mode/USB DAC mode, the multifunction button is forcibly set to: No Function.

Note: This button only responds in Android mode/Pure Music mode, and some functions only apply to FIIO Music.

The input priority between 3.5mm and 4.4mm headphone ports

The output will be given priority in the order of insertion.After connecting to the 3.5 port and then connecting to the 4.4 port, the sound will still come out of the 3.5 headphone port.

For better output effect, two headphone ports are not supported to output at the same time.

What TF card is recommended for M33 R2R?

Theoretically, the M33 R2R supports TF cards up to 2TB. The Sandisk SD card is recommended.