Earbuds

Earbuds, or music player, are a gameplay object that appear in The Sims 2: University, The Sims 3: Showtime, and The Sims 4: Fitness Stuff. They're portable objects that can play music for a specific Sim, gaining all the moodlets of music everywhere they go.

The Sims 2: University
When used, the Cozmo MP3 Player raises the Sim fun motive while they're rocking to it. Unlike the music players in other games, this object cannot be bought straight from buy mode. The item can only be purchased from the Sellafone Gadget Kiosk vending machine, which are found in some premade college and downtown community lots. It can also be obtained from the debug menu of testing cheats.

The Sims 3: Showtime
The music player can be purchased from buy mode, and can be placed in a Sim's inventory either manually or by interacting with it. Sims can listen to music, listen to a custom playlist, or listen to a random song.

The Sims 4
They can be bought from the order menu on computers if you have the add on university under "Purchase Earbuds". They can be stored in any Sim's inventory and have a few interactions:

While unequipped:
 * Listen To...
 * Turn On...
 * Place in World

While equipped (Self interactions): While the earbuds are being used Sims cannot sleep.
 * Turn Off
 * Change Station...
 * Listen to...
 * Change Volume...
 * Next Song
 * Dance