1,easy to use. 2,Adjustable handle. 3,can clean every corner During mass productionBefore our mass production, we will check with you carefully for the details. In order to make sure what we make is your wanted, we will keep following production.WarrantyAs soon as you get the goods, pls check them carefully, if any damage or problem,pls tell me,if our fault,we are sorry and will solve the ...