... manufacturers and suppliers of customized, cheap and easy-maintainable led display receiving cards sgr-r502 ROHS, FCC or IP65, welcome to ... /A301 etc. Two Ports is same ③:Testing button: after adjusted display working normal, then press by sequence, it come out color ... 、green、blue、white、slash.(Note: just software saved parameter same with display screen, and pull out the Network cable, Then press the ...