Sorry, that product is no longer available. But here are other great products for you to choose from.
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By unifying the navigation of multiple applications into one easy-to-use device, Space Navigator enables you to move effortlessly between supported applications.
The Ultimate in Freedom, Comfort and Productivity. TrackballWorks software lets you customize all 4 buttons, adjust cursor speed with Wireless connection via Bluetooth 4.0 LE or USB nano receiver.
Logitech MX ERGO - Trackball - optical - 8 buttons - wireless - Bluetooth, 2.4 GHz - USB wireless receiver
IKEY DT-TB-USB - Trackball - laser - 3 buttons - wired - USB
For a full-featured cordless trackball mouse, try the Cordless Optical TrackMan. Eliminating the need for cables, this item is a multi-function solution to your navigation needs.