The Abe Bluetooth Cassette Adapter. Too funky. And before you say it, yes my car does still have a cassette slot in it.
Now you can listen to your favorite MP3 tunes through any ordinary cassette tape recorder. The Abe BT 80C Bluetooth Stereo Cassette wirelessly connects Bluetooth-enabled music players or PC to your car or home stereo tape recorder. Just put the Bluetooth Stereo Cassette into any cassette tape recorder, pair and connect it to any Bluetooth-enabled audio devices such as MP3, PDA, CD or PC, you are ready to enjoy your digital music with full sound and convenience.