driving device 7 one second guide slot 429 of the upper cover 4 the through hole 179 of the ejector 17 the other second guide slot 429 and the other first guide slot 713 the straight stop 81 and the round stop 82 of the linking rod 8 respectively protrude from the sidewalls 42 of the upper cover 4 finally the straight stop 81 is deformed to rotatably fasten the linking rod 8 in position the label 9 is adhered onto the upper plate 41 assembly of the optoelectrical module is thus completed fig4 schematically illustrates a process of releasing the optoelectrical module from engagement inside a complementary cage 6 the cage 6 has an inwardly protruding retaining tab 611 formed at a front part of a bottom plate thereof the retaining tab 611 has a triangular hole 613 defined therein and the triangular hole 613 engagingly retains the triangular latch 137 of the optoelectrical module therein the handle portion 72 of the driving device 7 is pulled forwardly away from the front of the optoelectrical module accordingly the driving device 7 pulls the ejector 70 into the ejector seat not shown of the housing 1 the ejecting protrusions 174 of the ejector 17 enter a space not labeled between the bent portion 611 and a bottom of the optoelectrical module the ejecting protrusions 174 slidingly contact the retaining tab 611 and progressively force the retaining tab 611 away from the optoelectrical module as a result the retaining tab 611 is released from the triangular latch 137 the optoelectrical module is then ejected from the cage 6 by conventional spring means not shown located in a rear portion of the cage 6 it should be understood that various changes and modifications to the presently preferred embodiment.