Cheap crappy £5 bluetooth chip PCB off eBay, small mod to the cassette player in the factory stereo in my 1997 Range Rover, and I now have a bluetooth stereo th

Cheap crappy £5 bluetooth chip PCB off eBay, small mod to the cassette player in the factory stereo in my 1997 Range Rover, and I now have a bluetooth stereo that my phone works through without any annoying dangly dongles or aftermarket bodged-in stereo wiring. I could have spent a couple of hundred quid on a decent head unit, and then some more on the interfaces to go down to line level for the amps in the doors and subwoofer, and then some more on interfaces to make the steering wheel controls and CD player work, and then some more to ensure the door amps actually switch on. Or, PCB the size of my thumb, covered in heatshrink and held against the cassette drive PCB with a dot of hot glue.