If you are asking about the Modulator

The VRFM8 is not compatible
with Digital Rights Management.(DRM)

1. Start the vehicle’s engine without the
VRFM8 in the cigarette lighter socket.
Starting the engine with the VRFM8
pluged in may cause it damage.
Then plug the 12 Volt adaptor end of the
VRFM8 Modulator into the vehicle’s 12
Volt cigarette lighter socket or 12 Volt
Power Outlet.
2. The Red Power LED will light up
indicating the unit has power and the
LED for the radio frequency will show
87.7, the first FM pre-set radio
frequency.
3. Insert a USB flash drive with
MP3/WMA audio files, that do not have
Digital Rights Management(DRM) with a
bitrate of 128 Kb per second or less.
Save the files on the disk in the root
directory and not in folders.
4. Press the Channel Button to select
one of the following 14 FM Presets that
is not being used by any local radio
stations. VRFM8 remembers the last
broadcast frequency used.
87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9
106.7, 106.9, 107.1, 107.3, 107.5, 107.7, 107.9
5. Press the Play/Pause/Shuffle button to
play the first MP3/WMA file on the flash
drive. The Red LED will flash to indicate
the MP3/WMA player is working.
Press and hold the Play/Pause/Shuffle
for 3 seconds to play files in shuffle
mode, files will be played at random in
shuffle mode.
6. Press the Next Track/Volume Up
Button once to advance the to the next
track. Press and hold this button to
increase the volume of the file being
played. Too high a volume will cause
distortion. If you hear distortion,
decrease the volume on the VRFM8,
then increase the radio’s volume.
7. Press the Previous Track/Volume
Down Button once to return to the previous
file played. Press and hold this
button to decrease the volume of the the
MP3/WMA file being played.