Logitech MX ERGO Advanced Kabelloser Trackball mit neigbarer Bodenplatte
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
My, this guy named Webwit has quite a Logitech Trackball Collection! : r/Trackballs