It does not start without this. It is also good that the blade is deterrent and easy to use. Because the cutting edge is a life soon it will be bad, as there is a danger of scratching the glass surface etc. unless you replace it smoothly, so this number is appreciated as it is necessary to exchange smoothly. I will have a considerable period because the 3 blade is not currently in use and it is used with a single blade. Although it is written as Otsuka brush creation, the product was a product of Narby.