Logitech MX Ergo. It's a trackball. * Doesn't need to move on your desk. * Wireless, so if you want to have it away from your pc (standing desk for instance)

Logitech MX Ergo. It's a trackball. * Doesn't need to move on your desk. * Wireless, so if you want to have it away from your pc (standing desk for instance) that's no problem * trackball, and two angle to position it: no more pain in my arm