What is the little wheel below my CDROM drive for?

I know this is a simple question, but I don't know the answer to it. What is the little wheel below each of my two CDROM drives for? I've never used it, so I don't know what it is supposed to do or what I might use it for. Thanks for any response.

 

Roger: If yours are like mine, each wheel is right beside a small hole. That hole is for a headphone jack. The little wheel is a volume control for the headphones.

Does that seem right?

 

That be the private-listening earhole allright

 

Thanks to both who responded. That makes sense. I never use headphones so never had an occasion to try it out. thanks again.

 

and you don't really need a computer with that!

if you have an old PC power supply and an old CD-ROM drive, you can directly listen to audio CDs, either with a headset, or with amplified PC speakers

you may even turn a dead PC into a stereo if you remove everything 'cept power and CD-rom and stick in a 12-volt power amplifier and a couple of speakers - say, leftovers from a car-radio upgrade

a PC power cube has enough 12-volt juice of a car radio if you don't push the volume too high - say 20W max

 

Actually I think the little wheel he refers to is his volume control knob. You turn it to the right to crank up your music. It only works when you listen with headphones though.