Amazon.com: Logitech M570 Wireless Trackball Mouse – Ergonomic Design with Sculpted Right-Hand Shape, Compatible with Apple Mac / Microsoft, USB Unifying Receiver, Dark Gray (Discontinued by Manufacturer) : Electronics
Logitech Cordless Optical TrackMan download instruction manual pdf
Still using this old Logitech Trackman Marble FX. I never found a more comfortable new trackball to replace it with. : r/Trackballs