1. Battery charging: when the USB sound of the product is interrupted or the display flashes, it indicates that the voltage is not enough. Only when the product is charged can it work normally. Charging method: with the randomly equipped USB charging cable, plug the USB big head into the USB port of the computer or the USB port of the phone charger, and insert the other end into the DCIN charging port of the machine to charge. First try for about ten minutes to check whether the machine can work normally. If it can work, it will be charged. Otherwise, charging line and connection state should be checked.

 2. Functions of the machine: it can connect the phone with bluetooth and perform K songs with KTV software APP. It can be used as a microphone, recording and playing music as a bluetooth speaker.
 3. Music playback: the default function is microphone when starting up, and then connect the bluetooth device to play music in the phone. The upper and lower tunes can be switched and the volume can be adjusted.
 4. External audio input: connect mobile phone, MP3, MP4, MP5, tablet/desktop/laptop, game machine, DVD/EVD or other audio equipment with audio cable 3.5. It can be played as an external speaker.
6. Play/pause button: short press the function of pause/play in the state of play music.

7. Microphone k-song function: connect the bluetooth YSD device with the mobile phone, and install any APP software such as sing bar, national k-song and cool dog music on the mobile phone. Open the k-song, select the accompaniment mode in the software, and experience the journey of handheld KTV.
    The above functions are not clear to operate or the following logistics express requirements please click, thank you!