Abstract: A pluggable module (3) retained in a mating receptacle cage (1) which has a retaining tab (10) includes a housing (30) and an ejector device (34). The housing has a latch portion (310) retained in the retaining tab, a recessing portion (312) defined on a surface thereof, at least one inclined portion (314) located on the surface of the recessing portion. The ejector device includes a spring member (340) slidably received in the recessing portion and a driving portion (341) for pulling the spring member forwardly. The spring member is guided by the inclined portion and upwardly resists against the retaining tab for releasing the latch portion of the housing from the retaining tab of the receptacle cage.