sims
The Sims 2: University The Sims 3: Showtime The Sims 4: Fitness Stuff

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

Cozmo MP3 Player
TS2 Cosmo MP3 Player
A whopping gigabyte of pristine sound piped through headphones made in the heart of music asylum, Cozmo Street. Shut out the world, dance to your own beat with this sleek, exciting MP3 player.
Game The Sims 2: University
Buyability Community lot
Price in game §195
Object type(s) Fun
Electronics
Size 1x1

When used, the Cozmo MP3 Player raises the Sim fun motive while they're rocking to it. This object cannot be bought straight from buy mode. Instead, the item can only be purchased from the Sellafone Gadget Kiosk vending machine, which are found on some premade college and downtown community lots. It can also be obtained from the debug menu of testing cheats.

The Sims 3: Showtime

Portably Portable Music Player by Muze Inc.
Portably Portable Music Player by Muze Inc for Earbuds page
Tired of carrying that boombox around on your shoulder? Ever wish you could drown out your significant other's talking with something more pleasant sounding? With a breakthrough in portable electronics, now you can! No longer do you need to be home to rock out to your favorite tunes or tune out unpleasant noises. So put on the headphones, crank up the volume, and be prepared for a new way to listen to music.
Game The Sims 3: Showtime
Buyability Buy mode
Price in game §300
Object type(s) Fun
Inventory
Size 0.5x0.5

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 Sims 4: Fitness Stuff under "Purchase Earbuds". They come in several colors, and they can be stored in any Sim's inventory and have a few interactions:

While unequipped:

While equipped (Self interactions):

Sims cannot sleep with the earbuds on.