I had previously still tormented no electronic Callus in use and had me with a pumice stone and was once a month during the pedicure. Well, I can now save everything, because with this device it is really child's play to free his feet from ugly cornea! To be honest I can not remember ever having had so neat and soft feet as now. I'm almost a little bit addicted to it, and turn it at least every 2nd day. (-: A problem, however, the device! It eats the batteries on formally, so only four stars. It is therefore advisable to use batteries and these immediately upon release of the performance replace and reload. This works very well! Because the device is really only recommended with fully charged batteries. Nevertheless, for the price really great!