Play songs using step: put the MP3 switch to ON, the red lights start flashing, play music, then can use the + / - keys to adjust volume, use the < < or > > choose songs, is to use after please switch to OFF
Precautions:
1. Please do not charge the MP3 charger for more than 2 hours, otherwise it will easily cause the failure and damage of the built-in lithium battery.
Two, please don't focus on when charging or MP3 charger indicator lamp is what kind of state (also be in charge indicator light is not bright), 1.5 hours is full, then after a full charge MP3 or charger indicator light will not change any state.

Note: when charging, switch the switch to the ON position, not exceeding 2 hours per charge. Remember that!

 The main features :                                                                                                       
1) double USB charging, to satisfy the multi-electronic equipment in the car while charging.
2) use TF card/usb storage to play songs, and can be broadcast directly after power; (only USB2 supports U disk playback/charging port, USB1 can only be used as charging port)
3) support MP3, WMA music file format
4) support the audio input function, and the mobile phone will be inserted into the car MP3 audio hole through the AUX line to make the FM launcher acquire the high quality sound quality;
5) this player has the track automatic memory function, it can make your equipment, when the power is to play from the beginning sounds of distress, the player will memory to power is playing songs, next time play automatically from the beginning.
Notes:                                                                                                       
1) this product will be suspended/restarted during the working time or when the car is started. It is a normal phenomenon. Please feel free to use it.
2) when the product is not used for a long time, please remove it from the cigarette lighter.
3) only USB2 supports U disk play/charging port (the USB port inside), USB1 can only serve as the charging port (the outermost USB port). 
Simple troubleshooting:                                                                                                
A. If the light of the frequency indicator is not on when use, please check whether the insurance pipe is damaged, whether the power supply voltage is within the rated working voltage range, and whether the cigarette end is connected to the parent's seat;
B. If the indicator light shows, please check whether the audio source is not supported in the player.
C, if the display frequency is normal, but there is no sound, please check whether the volume button of the player is tuned to the minimum
D, if there is any noise in the playback, or the sound quality is not good, please try to lower the volume of the player, increase the volume of the car's stereo, or download a higher quality audio source on the player.
Use of in-car MP3 player:                                                                                    
1. Insert the machine into the cigarette lighter or the charging socket, the machine will automatically enter the playing state and begin to play the song;
2. Set the frequency of play; Short press M key, then press the up and down key to set the launch frequency to the ideal value;
3. Turn on the car radio and set the radio frequency to the same working frequency as the car MP3 player. For example, the MP3 frequency is 87.5 MHz, so the radio frequency is adjusted to the same (87.5 MHz). If you have a noise please change a frequency, use the time to avoid the local radio frequency, so that you can avoid interference and obtain high quality sound quality.
4. Play volume adjustment; Direct fluctuation knob switch to adjust volume.