... and 600 W lightning protection, further strengthens the anti-interference.5, Industrial standard design, very suitable for industrial site use ... product labels have a mark)2----------D+(A)3----------D-(B)5----------GNDCharacteristics:1), power supply: there is no external power ... writing data and yuntai control;(4), household appliances set control;(5), entrance guard system; Card;(6), all kinds of ...