COB means “chip on board” which integrates the led chip on the PCB directly. Compared to common SMD or GOB products, it is more reliable, more uniform color, higher protection level and contrast ratio. COB, SMD, GOB comparision LED cabinet design all modules cableless design. plug and play. Big module design W150*H337.5mm, one cabinet 4PCS modules, better flatness. Compatible model:P0.9, P1.25, P1.56，P1.875