I never thought that something works without hesitation!
MP3 music recorded on an 8 GB USB stick. But I have not created any folders, but placed all the titles in a row and thus
2 GB occupied. Had I 8GB occupied, could be heard 200 hours of music at a time, but my MP3 store is very limited.
Transmitter in a vehicle power outlet (have 2 of them, with a continuous current) is plugged in and turned on by pressing the button.
Frequency set on the radio and transmitter at 87.5 - and it worked immediately !!
You can freely select any frequency between 87.5 to 108.0 MHZ effective, a ev. Malfunction you have to try and halt
do not give up the same.
Although it is only a poor guide in English here, but you can cope.
With the 3.5 mm jack headphones can be connected, for example could be a passenger or even a separate music
Listen to audio book and the driver can hear on the car radio, what he wants, or have peace and quiet.
About the jack with jack to jack also a MP3 player should work stick, but has not worked for me.
But it could be that you need an adapter 3.5mm jack to USB standard (transmitter input), then it should go.
Also there seems to be slight differences in the models, some reviews indicate various languages,
with me everything is in English only.
The remote control works best if you are only short pulses.
Did the volume on the transmitter is set to 30, more control on the car radio, have a clear reception and no noise.
Again, you should just try a lot when it roars.
Disqualify volume on the transmitter low or high, and the car radio or vice versa taste, stop.
The only thing I miss is a random reproduction of the title, it is played one after another,
but that would be asking too much for this price.
Conclusion: it works and really for 10 euros you can not complain.
Addendum:
When the Stop / Pause button on the transmitter pressed a bit longer, random play (Random) can yet
be set.
An MP3 player can be plugged and played via the USB port.