In the jungle of wireless mice, this one is really above the lot. First a super fast delivery at no extra cost, then an intelligently designed product - finally! Rechargeable batteries are provided, which, at this price, is already more, recharging is easy (click indicates that the mouse is properly positioned on its base) and automatic battery saver function. The ergonomics of the mouse is good, its very nice weight (not too heavy nor too light), the USB cable is long enough base to make the system safe from accidental drops. I hope these qualities will hold over time - I just bought the product, so I can not prejudge its longevity, but the material seems solid. TBC then, but for now I have not found better!