For flash memory (USB only): 1) Plug FM modulator into vehicle\'\'s 12V adaptor 2) Plug you flash memory into FM modulator\'\'s USB port 3) Adjust the channel setting it the signal is interfered in your area (87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9MHz), or (106.7, 106.9, 107.1, 107.3, 107.5, 107.7, 107.9MHz) 4) Tune your car stereo to the same FM frequency as the FM modulator 5) Press the play button on the FM modulator 6) Music / audio transmits to vehicle\'\'s stereo system 7) Press the forward >>| or back, |10m 2) Operating current: 45mA 3) Transmission range: 87.5 MHz - 108.0MHz (interval 0.1MHz) 4) Frequency response: 20 - 15,000Hz 5) Stereo separation: 40dB 6) Transmission frequency deviation: