... PlayYesTracking MethodOptical Key-pressing Lifetimeover 3,000,000 timesBattery Type2*AAA ApplicationDesktop / Laptop Hand OrientationBoth HandsCompatible SystemWindows 7, Vista, ... Rubber Lacquer or Customized Remark: we are the real factory for the mouse, we have more than 100 models mouse for ... low, less than 0.1%. beside, we offer 1% spare parts. if you have interesting on our mouse, please contact ...