A4TECH WUT-5 ScrollTrack Internet 4D Trackball

This trackball, is really great design, but worst quality.

A4 Tech is the company. But in China, this brand is known as 雙飛燕. Meaning, “pair of flying swallows”.

In China, this brand has a reputation being the chepeast and lowest-quality.

This model has 2 scroll wheels.

This model has been around since at least 1998.

Silly marketing phrases on the box:

• Internet 4D
• 2 wheels for surfing the net faster
• Scroll in Windows® 98
• Up/down, Left/right scrolling easy
• 100% Microsoft wheel functionality
• Programmable middle button

Not Optical Mechanism

This trackball is pretty bad. It is not optical (nor laser). You can tell it's not optical because you don't see a camera (LED) window in the ball socket. If you open the thing, you see that the ball rolls two bars, and the bars have slotted wheels attached. It works like 1990's mechanical mouse with a ball under. [see How Mouse Works]

See also:

A4TECH WWT-13 Trackball

see also Best Trackballs 2019