Brand MI Colour Black Connectivity Technology Wireless Special Feature Wireless, Portable, Lightweight, Ergonomic Design Movement Detection Technology Trackball Number of Buttons 2 Ergonomic & Comfort Induced Design Excellent tracking accuracy of 1200 DPI High Resolution Ultralight weight -56g 2 buttons, 2 way scroll Battery life of 12 months lets you go longer between battery changes No delays or dropouts in the transmission, you can just plug & forget The product is powered by one AA battery , that is not included as a part of the package Wireless connection : RF 2.4 GHz private protocol The product is compatible with Windows and Mac