Section "InputClass"
    Identifier "Kensington Kensington Slimblade Trackball"
    MatchProduct "Kensington Kensington Slimblade Trackball"
    MatchIsPointer "on"
    MatchDevicePath "/dev/input/event*"
    Driver "libinput"
    Option "ButtonMapping" "1 8 3 4 5 6 7 2 9"
    Option "ScrollButton" "8"
    Option "ScrollMethod" "button"
EndSection