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A nice-looking older IBM-compatible trackball, the Mouse Systems model GK-T321 is a light-colored, thin, rectangular device. It uses a standard 9-pin serial connection.
This model is more compact than some trackballs. Its style matches that of most '90s and late '80s computers. No need for a USB port (or even a mouse pad) with this unit.
The Mouse Systems GK-T321's FCC ID is FSUGKTBZ. It is Taiwanese-made. The same company has manufactured various other computer input devices, including regular mice.
Tip: Use your arrow keys to scroll; a trackball is more likely to wear out than a keyboard and often costs more.
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