1. How To Use The Machine? We Will Supply The Installation Instructions Or Video And Our Engineers Will Train Your Operators. 2. How Long About The Guarantee Period? 2 Years. And We Supply Lifelong Software Upgrade Services For Our Customers. 3. Can You Supply The Air Compressor, Air Tank And Air Filters? Yes, We Can Provide Above Equipments, Our Standard Offer Includes Color Sorter Machine With Air Compressor, Air Tank And Filters. 4. Is Oversea Service Available? Yes, Our Engineers Could Go Abroad When Required.