I'm looking for a handheld speaker to connect to my computer. Basically, at my work computer I want to be able to occasionally hear sounds, but I don't want to have to pull headphones on and off. I'd like a little handheld speaker that covers my ear that I can just pick up and listen to occasionally (without disturbing my officemate).

I remember seeing in France (almost 20 years ago now) a standard phone that had an extra speaker attached to it, that was essentially the headset part of the phone minus the mouthpiece. It was on a cord, so one person could use the standard handset and another person could listen in on the conversation. Basically, I want the same thing except with a standard headphone jack.

I could butcher a set of headphones to create what I want, but that would limit me to only one channel (left or right).