An electrical connector assembly (1; 2; 3) includes a first connector (10; 50; 70; 90) and a second connector (20; 60; 80; 91). The first connector includes a first conductive body (11, 12; 32; 502; 71; 920) including a first mounting face, a plurality of first contacts (121; 321; 551; 921), a plurality of first shielding members (123; 323; 53; 720; 900), and a plurality first insulator (122; 322; 550). The second connector (20; 60; 80; 91) includes a second conductive body (21; 61; 822) for being mated with the first conductive body and including a second mounting face, a plurality of second contacts (220; 420; 620) and mated with the first contacts, a plurality of second shielding members (222; 422; 68), and a plurality second insulator (221; 421; 621). A total transmitting traces of the first contacts and the second contacts between the first mating face and the second mating face are circumferentially fully shielded.