PH6mm is small standard during LED display. This standard is a trend in the market day by day, so PH6mm belongs to indoor LED display. Actually, this standard has no need to recommend to our customer. There are two reasons as bellows, in the first place, its adopt SMD technique, the cost is higher than others: in the second place, this standard is rare, which technique is immature. But the latest new about ph4mm is positive. In consideration of protection grade, it must be IP54, just dustproof is ok. For brightness, indoor brightness arrive 2500 is enough (this range adapt for anywhere of domestic). As working temperature, -10 degree to 50 degree is okay (stored temperature is from -30 degree to 70 degree). Ph6mm use SMD technique, so the picture quality is better. If customer from rich country, and he doesn’t care about the cost, we could introduce this standard, which has vivid video and picture.