Mouse comes in retail packaging incl. Battery and CD. Have the mouse over a month in use and am almost fully satisfied. From an ergonomic point of view (which is certainly individually different) I find it excellent - light, handy, is simply good in the hand. The sample is ground regardless exactly, but I have not yet tested the function on gravel. Power-saving feature available, - switches off when not in use. Various functions can be konfiguriren via software. Radio transmission gaps quickly - with me as follows: Distance to PC 1.5m, receiver is in the back USB port of the desktop - in between a lot of "desk constructions". Only minus: The scroll wheel is too light for my taste. Conclusion: recommendable