CY-661 The product is low distortion FM modulator, you canmodulator any audio in your portable device such asMP3 player, MD player, CD player and VCD player ect to a FM signal, and your FM receiver in your car can receiv the FM signal and play it, this mean you can enjoy and music in your portabledevice freely even you are driving now. Take it home immediately! HOW to use: 1. Plug the unit into cigarette lighter in your car. 2. Connect input connector in the unit to your portable deviceoutput jack and just the portable device output to proper level by volume control. 3. Turn the 107.5 (+-0.2) frequency of FM receiver in your car to the frequency labeled on the unit and you can enjoy fantastic must in your portable device now. Product Specifications: Voltage 12V Operating Range>30m Operating Current 30mA 5mA Channel Isolation Ratio60db Operating Frequency Labeled on the unit Frequency Range 20-15000Hz