outdoor trivision billboad 1.Full set digital control equipment 2.Maintenance free 3.CE,ISO9000,National Invention Patent Trivision1.Full set digital control equipment2.Maintenance free3.CE,ISO9000,National Invention Patent outdoor trivision billboard,tri-vision display The specification:Scrollspeed : 0.15-0.24m/sScroll pictures :4-12/pcsScroll diameter :50mm ,60mm,100mm,150mmMotor power: 24v DC- ...