Abstract: A connector assembly (1) used to interconnect a primary circuit board (4) to an intermediate circuit board (5) includes a one-piece insulated housing (2) and an outer shell (3) partially enclosing outside of the housing (2). The housing (2) has a space (20) formed from a mounting side of the housing (2) to the primary circuit board (4) and a face (22) formed at another mounting side of the housing (2) to the intermediate circuit board (5). A plurality of conductors (25) is retained in the housing and extends from the space (20) to the face (22) and each conductor (25) has one tail portion (251) to be press-fit on the intermediate circuit board (5) and another tail portion to be engaged with a corresponding hole (41) on the primary circuit board (4). The one-piece housing and fewer interfaces are used, and the mounting method and mechanism of the conductors is simplified to reduce the cost of manufacturing.