I've been using Kensington trackballs
I've been using Kensington trackballs for over 20 years starting with the wired Expert Mouse (Trackball). I've used the Orbit wired mouse, the Expert blue-tooth/wireless trackball, the Orbit wireless trackball with touch scrolling and now the Orbit blue-tooth/wireless trackball with scroll ring. In order to reduce the number of USB dongles my desire most recently was for a blue-tooth trackball that was less bulky/expensive than the Expert to accompany my blue-tooth keyboard. I suggested that Kensington consider adding blue-tooth capability to the Orbit wireless mouse with touch scrolling. Actually I find the scroll ring to be preferable to touch scrolling so the Orbit blue-tooth/wireless trackball is just what I was looking for. WELL DONE Kensington I look forward to many years of service from this excellent product.