Dear, the screen is forbidden in Sichuan on 20 12, because the light pollution is too big. Why can't we see the stars in the sky? Because the lights in the city are too bright, when you look up at the sky at night, it is basically red and yellow lights. Moreover, too much loading is harmful to people's eyes, especially to drivers, and it is easy to cause glare. At present, large projects are generally approved and installed by relevant government departments. Expressway, residential areas, bus stops, China Unicom Telecom and other management programs basically use the wireless GPRS control card we developed.