The so-called dual-mode mouse, that is, there are two mouse positioning modes of laser and photoelectric, not connected to 2 computers at the same time (that is, connected to 2 computers at the same time you operate over?) The accuracy of laser positioning is already higher than photoelectric, why spend money to add a photoelectric equipment? This price in the domestic mouse is more expensive to fly, personally think that so much money is better than to buy a better process of European or American mouse