Targus AMU40US User Manual page 7

Using the 4-way scrolling tilt-wheel
Pressing the scroll-wheel left or right, enables the horizontal scrolling
feature.
NOTE: DOUBLE CLICK ON THE "TILT MOUSE" ICON IN THE TASK BAR WILL LAUNCH
THE MOUSE SETTINGS SCREEN. YOU CAN EDIT THE SETTINGS AND PREFERENCES
IN THIS WINDOW.
Activating the Universal Zoom function
The Universal Zoom function
can be enabled in the Mouse
Setting screen.
In the Mouse Setting screen,
under the Button tab, scroll
down the function list and select
the Universal Zoom function
then click Apply.
Press on the scroll wheel to
activate the zoom function.
Targus Optical Stow-N-Go TM Notebook Mouse