INSTRUCTION FOR USE 1. The unit can change the audio signal to the frequency modulation signals and send out to the radio system in the car. Then you can enjoy the music without any refitting to the original audio system. With any common MP3(Of course ,it may be any portable music equipment like MP3/CD/VCD/DVD) ,you only need this unit to make a complete MP3 audio system in car. 2. Insert the power stick of digital audio transmitter into the cigarette lighter jack in car, and the orthogonal plug into the audio output) 3. With adjusting the optional switch flank to change the frequency of the digital audio transmitter to be same with the frequency of radio receiver, then you can hear the music from the audio output. 4. Applying the 3D technology to make the quality of voice come to that of MP3,MD,LASER and TV effect. 5. Applying the PLL technology to insure the stability o f modulated signals sending. 6. Transmitting the signals by wireless. With frequency range between 87.0 and 108.5 MHZ. Strong power of anti-interference. 7. There are two keys on the side of the transmitter,you can use them to adjust the volume at will. FUNCTION CHARACTERISTIC: 1. Super clear LCD display with blue backlight. 2. Using Compression technique 128KBIT/S and high fidelity circuit, the sound quality is guaranteed,it can lock the channel on any automobile radio which has the function of AUTO-SCAN. 3. Very good ability of anit-shock and anti-interference. 4. The transmiiter can recognise all kinds of SD card which has big capability to store the music easily,you can also use the card to download the music from your computer or website,it抯 for free.