... free 3.CE,ISO,many National Invention patents Street display stand 1.Full set digital control equipment,2.Maintenance free3.CE ... ,ISO,many National Invention patents Street display stand ,trivision billboard The specification:External frame: 136-145mm,thickness:1 ... .8-2.0mmWidth of triangle prism: 126mm×3 sides Image flipping time : each face 6-12 seconds / customized Power supply ...