This gadget is the best way I’ve seen to play your MP3s through your car stereo. It’s a little, battery-powered FM radio transmitter. Plug it into the speaker jack of any device (MP3 player, laptop, Casiotone, drum-machine, dictaphone, cellphone), tune it to an unused FM station, then tune any nearby FM radios to the same station and your device plays through your radio!LinkDiscuss