... group The single color common module1.Indoor P4/P4.75/P7.62 single color led display module.2.Outdoor P10/P12 ... data via the telephone line5.Many specifications:P4,P5,P6,P7.62,P8,P10,P12.6.Many color to choose:red ... not the problem !!! Lobby use PH 4.75/p3.75/p7.62/p10 led display screen