The FM Transmitter works. All functions are limited but indeed go without problems (USB / SD / AUX). The problem I have with the device is the very weak broadcast signal. Is a radio station near the transmitted signal begins the already rushing to. Mostly the transmitted signal in these moments is almost inaudible to you represents the transmitter and your radio to another clear frequency. Unfortunately, this is a vicious circle and I am used to from other transmitters more. He fills up very very inferior processed at Low to plastic! That which adds even more aggravating is that I "hear" the charging current of my alternator can through this transmitter. I give I hear more gas a louder whistling sound and vice versa.
Unfortunately, I can here be no buy recommendation
