... function: plug in TF card, con- nect to computer by USB 2.0 cable, then download music and ... TF card.4.Sound design: Use best horn, ensure HI-FI acoustic. Use best decode chip, WAV original sound decode. ... auto. Charging, red light keeps flashing, light stop, the battery is full of power. 7.Press on/off button ... auto after 30s8.OEM are welcome High quality&best computer headset with TF card function