Jukebox (Fallout 3)

The Jukebox is a House improvement you can buy for your Megaton House or Tenpenny Tower Suite. It's value is 500 bottle caps. The Jukebox will play whatever station was last activated on your Pip-Boy when activated.

The Jukebox won't work at Tenpenny Tower until you've boosted GNR's signal

There is no real purpose buying it, other than for the aesthetics, since your Pip-Boy 3000 will play Galaxy News Radio as well.