Bluetooth speakers, in particular ... either temporarily or permanently. Sonos, the pioneer of multiroom wireless audio systems, has done this several times during its existence.

He outfitted his ride with an aftermarket head unit that can support the Bluetooth A2DP profile, provided he buys the ridiculously overpriced kit sold by Pioneer. Reluctant to shell out more money ...

The best portable Bluetooth speakers don't make you choose between sound quality and convenience. Gone are the days of dragging around a Boombox-like device as if you're in a 90's music video.