... elements, all of which are gold plating.4. The shell of the products is nickel plating or cadmium plating, ... M – G n P BD: shell locating rectangular connectorX: type of shell-E, A, B, C, DM: pure sealing typeG: ... 9, the number of shell A’s contact element is 15, the number of shell B’s contact element is 25 ... , the number of shell C’s contact element is ...