VI.USB card reader, sound card use Plug the USB cord into the machine [USB / AUX] jack and the other end of the USB into the computer's USB port. 1, Without inserting TF card, open the [ON / OFF] switch, issued a "boom" sound, the machine enters the USB soundcard mode.
3, after the speakers connected to the computer, the MP3 songs stored could be played when the computer is on.
When the power is low, the system will automatically adjust the maximum volume output, and play "battery voltage is low, please charge (Voltage is insufficient, please charge)", the system will automatically shut down, then please charge; If not using the machine, at least once a month charge, you can protect the battery to extend battery life.