Those little car cassette adapters are and were invaluable to people wanting something other than a cassette player in their car without the cost of upgradin
Premier Cassette Adapter
Fixing the Automatic Reverse Flipping of a Cassette-to-Aux Adaptor - iFixit Repair Guide
Set the vibe, wherever you go. Now you can turn any cassette player into a digital music player with our Cassette Adapter. Out-of-date technology can no longer keep you from sharing your favorite content. Drive onn.
Onn. Cassette Adapter
CNCASSETTE - Cellet Cassette Audio Adapter for iPhones iPods Android P – Cellet Retail
Aluratek's Universal Bluetooth Audio Cassette Receiver is the perfect way to transform your car's cassette player into a Bluetooth audio receiver - cable free! Perfect for vehicles that have an old stereo cassette player and do not have a built-in auxiliary port. Simply insert the cassette receiver into your car's cassette deck and pair to your smartphone, tablet or MP3 player. In seconds you can stream your favorite songs through your car's speakers.
Aluratek ABCT01F - Universal Bluetooth Audio Cassette Receiver
Aux to Cassette Adapter Teardown and Explanation
Portable Cassette to MP3 Player Mini USB Tape Player MP3 Converter with 3.5mm AUX Input Software CD Cassette Capture Audio - AliExpress
Fix a Cassette Tape Adapter
Fixing the Automatic Reverse Flipping of a Cassette-to-Aux Adaptor - iFixit Repair Guide