... free 3.CE,ISO9000,National Invention Super High Mosaic Trivision Billboard1.Full set digital control equipment2.Maintenance ... free3.CE,ISO9000,National Invention PatentSuper High Mosaic Trivision Billboard, Arc trivision billboard,tri-vision displayThe specification:Scrollspeed : ... side and double side.7. The material with High –quality stringy stainless;2.Acrylic plastic,3 Anti-oxidation ...