for a pretty junky little piece of technology (cheaply made and looks it), but danged if it doesn't work hooked up in my truck! The downside is that the volume fluctuates quite a bit while driving, and there is some variable hiss & crackle. No idea why any of this is happening, considering that the device is ~2 feet away from the truck's antenna. I have tried several frequencies and they're all about the same, behavior-wise. Hmmm...maybe it's my cheap truck! No directions are included, BTW--tacky. The remote has no effect on my Sansa Clip mp3, but I use the Sansa's controls, so this is not a problem. For the price, I can live with it.
With the help of this MP3 Wireless FM Transmitter you can listen to MP3 files in your car via an SD or MMC card slot or USB flash memory! This 3 in 1 in-car cigar style FM transmitter supports 206 FM channels and has an SD/MMC card slot and a USB port so you can listen to your MP3 files on the road! Simply plug into your car's cigarette plug turn on your car stereo and tune to the same frequency! Plug in an SD/MMC card USB flash drive and even an MP3 player and listen to your favorite music on the go! The LCD displays the volume and name of the song!