Each of the surfaces of the extending portions 22 of the plurality of the conductive terminals 20 adjacent to and projecting beyond the front surfaces of the two sealing boards 43 is coated with the layer of the insulation ink by the pad printing technology to form the insulation layer 24. The length of the insulation layer 24 of each of the extending portions 22 of the two rows of the plurality of the conductive terminals 20 projecting beyond the front surfaces of the two sealing boards 43 respectively is approximately 0.25 mm. The insulation layers 24 of the extending portions 22 of the two rows of the plurality of the conductive terminals 20 are exposed to the top surface and the bottom surface of the second docking portion 123 respectively, and are adjacent to and project beyond the front surfaces of the two sealing boards 43 respectively. Each of the surfaces of the front ends of the extending portions 22 of the two rows of the plurality of the conductive terminals 20 exposed out of the insulating housing 10, and adjacent to and projecting beyond the front surfaces of the two sealing boards 43 respectively is coated with the layer of the insulation ink by the pad printing technology to form the insulation layer 24. Each of the surfaces of the rear ends of the extending portions 22 of the two rows of the plurality of the conductive terminals 20 adjacent to the front surfaces of the two sealing boards 43 respectively is capable of being coated with the layer of the insulation ink by the pad printing technology to form the insulation layer 24 and being received in the one of the plurality of terminal grooves 124 of the insulating housing 10.