1.comes with 5 programmable button, you can edit the each key as your left hand use and some windows shortkey, over 50 kinds of shortkey are available, it is quite useful and convenient; 2.comes with a ergonomic shape,it is very comfortable; reducing weariness effectively; 3.wireless design make moving much freely; 4.rechargeable design, save your money and time for changing the battery; 5.USB design make the installation very easily, plug and play; 6.optical sensor,don't like the old ball mouse,no need to clean the ball any more, Accurate motion estimation over a wide range of surfaces; 7.ID change solution (256 random IDs) to resist the interference from the same device,ID retention function when battery removed. 8.Low battery detection & display,remind you recharge in time; 9.High resolution up to 800cpi; 10.Power down after no action over 8 minute,also can power down by power button(on the topside) 11.any key automatic wake up function from sleep; 12.comes with 2 usb ports for connect your camera or USB storage disc.