I was looking for a device that plugs into my car's 12V cigarette lighter outlet, connects with my phone's Bluetooth, outputs the audio to 3.5mm aux (my car has aux input but no Bluetooth), has no battery, automatically turns on with my car, has next and previous track buttons, and outputs USB-C with at least 30W.
Amazon's search filters were useless for this, but their LLM was able to read through reviews and suggest products that come very close. Unfortunately, no exact product exists that fulfills all the requirements.
It may be better than the uselessness of the Amazon search box, but that's a very low bar.