Learn about this Device
10
11 <
> Previous/Fast Reverse/Left
12 <OK> button OK/(Switch screen information or
Play/Pause, to be user-defined)
13 <■> Stop/Down
14 <HOLD> Lock keyboard
15 <GAIN> Headphone output gain
16 3.5mm plug-headphone interface
17 LINE OUT port
18 SD card slot: support SD/SDHC/SDXC
19 USB 3.0 port
20 Power port: to charge lithium battery or energize
this device via power adapter