Hey, it's cool that you shared the sale, but the tag=paktinatcom-20 part of the link looks a lot like an affiliate link.
I don't know what this sub's rules are on those and whether you copy/pasted that on purpose or on accident, but here are two non-affiliate links (and a lot shorter!)
https://www.amazon.com/dp/B0043T7FXE
https://smile.amazon.com/dp/B0043T7FXE <-- if you want a portion of the sale to go to a charity of your choosing
In any case it looks like the sale is over with, so probably doesn't matter anyways.
It basically looks like a cross between an Elecom Deft and a Logitech M570 or even Logitech MX Ergo
As a fellow trackball user, I have no idea how people can use that thing. I use the thumb operated version and it seems much more intuitive since the thumb can move in circles quite easily, where as long regular fingers don't seem to have the physical potential to maneuver as finely or cleanly.
I use this one at work. The trackball is still worked with your thumb, but you still use your index and middle-finger for the buttons and scroll-wheel. It is wireless.
Logitech used to make a wired version of it, but it has been discontinued. Demand for the wired version has caused its price to be inflated to a ridiculous level. From what I have read, the wired version is slightly bigger and some people say it's a bit more ergonomic. I don't know, I've never used it.