A jukebox is a partially automated music-playing device, usually a coin-operated machine, that plays a patron's selection from self-contained media. The classic jukebox has buttons with letters and numbers on them, which are used to select specific records. Some may use compact discs instead. Disc changers are similar devices for home use; they are small enough to fit on a shelf and can hold up to hundreds of discs, allowing them to be easily removed, replaced, or inserted by the user.