An electrical connector (10) includes an elongated insulative housing (12) defining a central slot (14) to receive a module (100) therein. A plurality of contacts are provided by two sides of the central slot (14) for mechanical and electrical engagement with the corresponding circuit pads on the module (100). A pair of platforms (18) are provided adjacent two opposite ends of the housing (12). A pair of latch devices (20) are provided at two opposite ends of the housing (12a) wherein each latch device (20) includes a plastic member (22) and a metal member (24). The plastic member (22) integrally extends forward from the housing (12) with a locking head (48) proximate the distal free end thereof. The metal member (24) includes a first vertical plate (26) in abutment with the plastic member (22) for cooperation with the plastic member (22) during the lateral rotative movement of the plastic member (22), and a second vertical plate (30) for retaining the metal member (100) in position with regard to the housing (12). An upward tag (42) and a downward tag (44) respectively extend from a horizontal bend (38) which extends horizontally and inward from the lower edge (40) of the first plate (26) wherein the upward tag (42) provides linking-up between the metal member (26) and the plastic member (22), and the downward tag (44) provides a stopper function for preventing over-lateral movement of the plastic member (22) with regard to the housing (12).