A: P1 P2 P3 P4.... P8,P10 means the pixel pitch is 2mm, 3mm, 4mm.... .8mm,10mm, which determines the resolution of the LED display. The smaller the pitch, the higher the resolution. Usually, the pitch of indoor full-color LED display is P0.7, P0.9, P1.25, P1.5, P1.8, P2, P2.5, P3, P4, P5, and outdoor full-color LED display is P2, P2.5, P3, P4, P5, P6, P8, P10 and etc.