The JO BEAU drum technology™, which forms the basis of Jo Beau's success, ensures the flawless processing of branches and their green waste. In order to guarantee optimum efficiency, we recommend that you regularly check the service life of the knives and that you sharpen them in time. Every device sold is accompanied by a custom-made manual. It explains in detail how to sharpen, turn and/or replace the knives. Lost your manual? Request a new one here.