The Apple Desktop Bus Mouse was redesigned and named for its new ADB connector that was used in Macintosh computers from 1986–1998. This mouse featured low-profile blocky design with a flattened pentagonal side profile and a flat rectangular (slightly trapezoidal) bottom. It had a single button and tracked using a rubber ball.
I have three different variations of the ADB Mouse in my collection. One has a dark ring supporting the trackball, another has a light ring matching the color of the body of the mouse, and a third model uses a ring with an arrow.
The ADB port was a round, 4-pin plug that was used on the Apple IIGS (1986), Macintosh computers, and licensed for use on NeXT computers. The Apple Desktop Bus system was created by Steve Wozniak as a single connector for input devices that was inexpensive to produce. The Macintosh II and Macintosh SE were the first Macintosh computers to use the ADB port.
Source: Wikipedia.com
