When Kodak introduced the Disc system in 1982, there were four cameras, the 2000, 4000, 6000 and 8000, in ascending order of price and features. The 2000 was not meant for the US: it was the very basic machine, and it used a 9v battery. The 4000 was the base model with a silverish-bare-metal finish, and all it had was a shutter button and a slide switch for the lens cover. The 6000 was black and it had a black cover which folded down out of the way (or under and back so that the camera could sit upright on a table). Since the folding cover protected the lens, the slide switch was used for a close-up lens which slid in and out of position. The 8000 was the top of the line. For the extra money you got a self-timer, single-shot and 3-shot burst modes; you got a little LCD clock-alarm built into the cover (which is not integrated with the camera at all, so it's just a tiny travel-alarm), and you got spiffy a gold finish.
I got this because it was part of a box of cameras I bought, and it (unless you count the 2000) completes the set.