we could provid indoor type  and outdoor type, specification as following:
P4 SMD(3-in-1) Indoor Full-Color Module
pixel pitch:              4.4 mm 
pixel density:          51,653 dots/sqm
tile resolution:       32*32 dots
pixel config:            3-in-1 SMD
environment:          indoor
color:                        full color

P6 SMD(3-in-1) Indoor Full-Color Module

pixel pitch:              6 mm
pixel density:          27,778 dots/sqm
tile resolution:       32*32 dots
pixel config:            3-in-1 SMD
environment:          indoor
color:                        full color

P8 SMD(3-in-1) Indoor Full-Color Module

pixel pitch:              8 mm
pixel density:         15,625 dots/sqm
tile resolution:       32*16 dots
pixel config:           SMD 3in1
environment:         indoor
color:                       full color

Out door series:

 P12.5 Outdoor Full-color Module

pixel pitch:              12.5 mm
pixel density:         6,400 dots/sqm
tile resolution:       16*8 dots
pixel config:           2R1G1B (Oval LED lamp)
environment:         outdoor / indoor
color:                       full color

P16 Outdoor Full-color Module 

pixel pitch:              16 mm
pixel density:         3,906 dots/sqm
tile resolution:       16*8 dots
pixel config:           2R1G1B (Oval LED lamp)
environment:         outdoor
color:                       full color

 P20 Outdoor Full-color Module

pixel pitch:            20 mm
pixel density:        2,500 dots/sqm
tile resolution:      16*8 dots
pixel config:          2R1G1B (Oval LED lamp)
environment:        outdoor
color:                      full color