upper face of the tongue portion 12 the protrusions 4120 are received in the slits 122 of the tongue portion 12 as the slider 41 moves along the mating direction in response to insertion of the mating component the protrusions 4120 move in the slits 122 during the movement of the protrusions 4120 in the slits 122 the transverse portion 412 moves across the contacting portions 21 due to elasticity of the contacting portions 21 the spring elements 42 are received in the slots 112 with one end thereof contacting with the base portion 11 and the other one end thereof contacting with the transverse portion 412 i e the spring elements 42 are compressed between the base portion 11 and the transverse portion 412 for providing elasticity the pin member 43 has a first end not labeled retained in the opening 113 and a second end not labeled slideably moveable in the heart shaped slot 4110 the principle of the heart shaped slot 4110 of the ejector 4 is well known to persons skilled in the art and it is not described herein in detail the spring elements 42 and the protrusions 4120 are both numbered in two in the preferred embodiment it is just for providing balanced force but it is not limiting in other embodiment only one spring element 42 and one protrusion 4120 achieves the ejection of the mating component if adjusting the positions of the spring member 42 and the protrusion 4120 referring to fig1 4 the metallic shell 3 comprises a top cover 31 and a bottom cover 32 respectively located above and below the insulative housing 1 the top cover 31 has an elastic.