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Re:The 19th Century plug that's still being used by dredmorbius on Monday August 01, 2016 @05:42AM (#12201142)
Micro FM transmitters. Plug into the 3.5mm jack, power from the cigarette / accessory adapter. Usually a choice of frequencies to broadcast on which can be picked up over your car's FM receiver.

Quite frequently found at highway truck stops, though almost certainly other electronics stores as well.

Re:The 19th Century plug that's still being used by semi-extrinsic on Monday August 01, 2016 @05:14PM (#12206046)
Plus, they're crap. Seriously. I bought one of the more expensive ones, with auto channel scanning, still crap. Made me go back to burning CDs until I put an aftermarket stereo with 3.5 mm jack in. Fortunately that's a near-universal feature these days.
Re:The 19th Century plug that's still being used by tunap on Monday August 01, 2016 @01:12PM (#12204121)
And suffer from interference and low volume; has been my experience.

Wireless is convenient.

Wired is reliable.

YMMV.