Product Description --Able to change the audio signal into frequency modulation signal and transmit it to the speaker of the car and play. It is convenient operation and economic, for there no need to change any original equipments of the car. --Input Voltage: 12V --operating Range: <10m --operating Current: 30mA ?mA --channel Isolation Ratio: 60db --operating Frequency: 4 frequency (FM106.7, FM107.1, FM107.5, FM107.9) Labeled on the unit (Remark: We could setup frequency according to your requirement) How to use --Connect the input connector of this unit to the output jack of your portable device, --then adjust the output voice of portable device to a proper level by volume control. --Turn the frequency of FM receiver in your car to the frequency same as labeled on the unit and play, --Then you can enjoy fantastic music from your portable device Product Description --Able to change the audio signal into frequency modulation signal and transmit it to the speaker of the car and play. It is convenient operation and economic, for there no need to change any original equipments of the car. --Input Voltage : 12V --operating Range: >30m --operating Current: 30mA ?mA --channel Isolation Ratio: 60db --operating Frequency: 4 frequency (FM106.7, FM107.1, FM107.5, FM107.9) Labeled on the unit (Remark: We could setup frequency according to your requirement) How to use --Plug this unit into cigarette lighter in your car. --Connect the input connector of this unit to the output jack of your portable device, --then adjust the output voice of portable device to a proper level by volume control. --Turn the frequency of FM receiver in your car to the frequency same as labeled on the unit and play, --Then you can enjoy fantastic music from your portable device