Wireless Silent Optical Computer Wheel Mouse DPI Exchange 5 Button (Black) Wireless Silent Optical Computer Wheel Mouse DPI Exchange 5 Button 97% Click Noise Down (reading room,library,conference room,dormitory,etc.) DPI Adjustable (800 - 1200 - 1600), 97% Click Noise Down(left,right,wheel button) 2.4GHz nano receiver and storage space. Battery replacement is easy. Dimension: Mouse 60 x 98 x 34mm, Receiver 19 x 14.5 x 6.5mm