The Logitech Touch Mouse T620's wide-ranging gesture control functionality, Windows 8 shortcuts, and unique ability to run off of one or two batteries justify its price tag.
Logitech Touch Mouse T620 : Angle
Logitech Touch Mouse T620 : Top
Logitech Touch Mouse T620 : Profile
Logitech Touch Mouse T620 : Angle
Logitech Touch Mouse T620 : Bottom
