Features: 1) Built-in MP3 format decoding chips 2) 14 channels clear reception for your choice 3) Automatically reads the mp3 files from USB Flash Disk or MP3 Player. 4) Operating Distance: Up to 30 meters. 5) Digital indicating (frequency and volume) 6) Channel isolation ratio: e=72dB 7) Frequency range: 20Hz - 15KHz 8) Working current: 50mA ±10mA 9) Output current: 100mA (max.) 10) Accessories: audio cable (3.5 - 2.5mm stereo) 11) Size: 9.5cm, 5cm remain long after plugging into cigarette lighter 12) Channel range: (87.7/ 87.9/ 88.1/ 88.3/ 88.5/ 88.7/ 88.9MHz) and (106.7/ 106.9/ 107.1/ 107.3/ 107.5/ 107.7/ 107.9MHz) Directions: 1) Plug the FM transmitter into cigarette lighter of your car 2) Plug the USB flash disk or MP3 player into the USB port 3) Press the CH button to select frequency 4) Turn on your FM turner of your car, choose the frequency which the same frequency of the FM Transmitter 5) Adjust volume to proper level, press Play button once, then you can enjoy it 6) You can turn off the FM turner and plug the headset into audio port, enjoy your music 7) Except USB port, you can connect others music players by audio cable (included), such as MD, mobile phone, PDA, and walkman N.W.: 34g G.W.: 92g (with blister and audio cable)