a. On/Off When set to "On", the 4G Dual Sensor System will calibrate your mouse to the specific surface, optimizing it for fast and precise tracking. When set to "Off", your mouse will perform without the added benefit of surface calibration by the 4G Dual Sensor System. This is only necessary in certain circumstances such as when a surface is multicolored. Otherwise, the general recommendation is to keep t he surface calibration setting to "On" permanently to get the best out of your mouse. b. Lift -...