especially use at indoor stage,stadium,school,railway station place,low ... voltageAC220V±10% or 110V±10%5.master system:DVI display card+main controller card+transmission ,Optional6.main technology ... total size:8.064mx6.016m=48.51sqm,item is indoor P4 full color,high clearity,high refresh,all of ... our engineer went to USA install and debug the led display by themselves,it proves that we have the ability ...