This trackball seems to be reasonably priced on Amazon Japan. It is cheaper than a basic Kensington trackball.
About this item:
- The HUGE, a large ball with a diameter of 2.0 inches (52 mm), allows you to move the pointer over a wider range of motion with one operation
- It has a speed change switch that can switch the moving speed of the pointer into 3 stages of 500, 1000, and 1500 counts
- The upper part of the main body uses memory foam palm rest that allows you to place the entire palm from your wrist to reduce the burden on your wrist due to long time working PC
- The trackball motion detection sensor is equipped with a high performance optical sensor that is gaming grade
- We have thoroughly analyzed the color and thickness of the coating layer suitable for optical sensors, and reviewing the design of the trackball from scratch, resulting in the ultimate pointer tracking performance
- The support sphere is a large 0.1 inch (2.5 mm) diameter artificial ruby and the highest quality support balls are carefully selected for smooth surfaces. In addition, since the support ball is large, the support ball is less likely to bury in the dirt such as hands, reducing maintenance frequency
- The left and right buttons are made with OMRON switches that are highly reliable and have a reputation for the click sensation
- Equipped with "Forward" and "Back" buttons to increase the efficiency of browsing the web
- Equipped with a tilt wheel that allows you to scroll left and right by simply tilting the wheel. It is convenient for you to operate the long side screen such as Excel
- There are 8 buttons and 2 directions on the left and right scrolls, total 10 functions can be assigned Button function assignments can be changed using the free downloadable Elecom Mouse Assistant
This trackball is definitely large. I found it works well, however I needed to clean the ball frequently to keep the motion really smooth. It still worked fine without the regular cleaning, just not as nice to use. I recall reading there may have been another ball one can purchase to replace the original ball with.