... port *CE,FCC,ROHS *OEM logo print Kinds mini ball shape usb mouse Descriptions:*Ergonomic design, grip comfort, flexible operation, ... long service life.*Using the latest optical sensor technology, precise positioning, resolution 800DPI*Optical sensors, a precise positioning, applies ... operating force: 80 ± 20GF*3D buttons: 170 ± 30GF (mouse button center vertical)*Switch service life of 3 million times ...