Well, I do not buy this product for the first time, the enthusiasm is initially quite large, but quickly gives way to reality. What I mean: I think there are differences in quality. Times the shear part lasts longer, sometimes not as long as expected. So the manufacturer speaks of about 18 months of field and even shave, so I have not been able to confirm so. For me to keep the app only max. nine months, sometimes less. But, as it happens.