Fiio M3 Pro - Microphone; USB Port; 3.5 mm Headphone Output;Line-out; Display Introduction

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It supports a standard micro SD (TF) card, theoretically up to 2T.
2.2.6 Microphone
Do not cover the microphone hole when recording, otherwise it would make the
recording a bad quality.
2.2.7 USB port
It is for data transfer and power charging.
2.2.8 3.5mm headphone output/Line-out
With the headphone output and line-out all in one 3.5mm port, it supports TRS and
TRRS headphones, except in-line remote control.
3 Display introduction
3.1 Power on/off display and homepage