You have to inform ish advance

Have the part bought to save money. It's significantly cheaper compared to Oral-B products. However, here are some properties are already described by others, you should not undervalue:
1. It's really, really! loud!
2. There is no pulsation in the water jet. Although a uniform beam cleans, but it can act partly unpleasant.
So I would not buy it again. But here everything was before, there is no reason to complain.