new design, 1000/1600DPI, 5 buttons, silver, black, ergnomics design, ITEM NO.:SI-939NAME:2.4g wireless mouseCONNECTOR:mini receiverRESOLUTION:1600cpiMouse button:5COLOR:silverKEY LIFE:above 3000,000POWER SUPPLY:2 AAA batteriesWORKING DISTANCE:10 meter Compatible with Windows ME/2000/XP/VistaPACKING:blister color boxUnit G.W.: MEANS 101.6(L)×55(W)×37.8(H)±0.5mm