Has anyone used Wireless FM transmitter? As 1.4 Emotion doesn't have a USB option, I am exploring the possibility of using this device. Any suggestions? I did some basic research on this device. It has a USB/SD card slot and interacts directly with the FM/MP3 player. You can play the media files on the USB through the FM/MP3 player. The FM tuner can locate the frequency configured in the transmitter and play the files on the USB connected to the transmitter.