... 1)P4 SMD3in1 full color indoor led screen 2)High Definition indoor led screen 3)Energy saving led screen p4 ... contrast of red, green and blue can be adjusted by software,100 scales are available, color temperature is adjustableInput ... , bank, stock exchange, station, port, marketplace, telecommunication, department, school, monitor, restaurant, entertainment, 3. Full spec, such as P4mm,P5mm, P6mm ...