It’s an Elecom Huge wired model. I’ve owned three, had two fail on me, both to left click double clicking on single touch. First time could have been a fluke and I replaced it, but the second failed inside of four months. I said hell with it, took it apart, desoldered the switch and replaced it with a Kailh GM2.0. Worked like a charm and it’s been fine since.
Ironically, my oldest Huge is still working fine. Apparently they were originally using Japanese Omron microswitches that were quality and seem to last forever (case in point, the oldest trackball is from 2019 and no issues). With the newer ones I bought, they apparently changed to using Chinese Omron switches of poor quality.
Sucks, but I have a few spare Kailhs laying around if any of the other buttons die now.







I started with a Logitech Marble Mouse back in the day, thumb-balls were never really my thing.