vintage marble mouse the two button type. How do you scroll? I read press both buttons together but... : r/Trackballs
Logitech TrackMan Marble FX Trackball
Logitech T-CJ12 - Trackballs.EU
MarbleScroll for Logitech Trackman Marble – Primož's Few Projects
LOGITECH TRACKMAN MARBLE (USB) | Compact | 2.4 GHz Wireless | Long Batery Life | Programmable buttons | Compatible with Windows® XP, Windows Vista®, Windows 7, Windows 8, Windows 10, Mac OS® X 10.5 or later | 3 years warranty | Lazada Singapore