A connector assembly (100) includes a receptacle (2) having an inwardly extending latching tab (21), and a plug connector (1) insertable into the receptacle. The plug connector includes a housing (12) defining opposite first and second sides and a pair of grooves (123), and a releasing mechanism (11) including an outwardly tilting releasing tab (110) located at the first side, a lever (114) located at the second side, and a body portion (116) formed with a pair of inverted U-shaped resilient portions (115) received in the grooves. The releasing tab is movable rearwardly, by a rearward movement of the lever through a deformation of the resilient portions, to outwardly push the latching tab for permitting an extraction of the housing.