4
recording
2 Previous
：
Short press to switch to the previous
track, long press to rewind while playing
3 Next
：
Short press to switch to the next track,
long press to fast forward while playing
4
M button
：
Long press to enter the setting menu,
short-press standby mode to switch music files or
recording files, play status short press A-B interval
repeat
5 Play button: long press to power on/off, short press
play/pause during playback, short press to enter
submenu or save modify
system setting in main
menu
。
6 Stop/return button
7
USB port: Connect to a computer to upload and