An electronic module (100) includes an elongated housing (10) having a front portion and a rear portion, with a pair of spaced guide members (123) integrated with a peripheral portion of the rear portion; a latch mechanism (60) assembled to the housing, said latch mechanism including a slider member (61) disposed between and supported by the pair of guide members, a bail member (62) pivotally engaging with the rear portion of the housing and further linking with the slider member; and rocking the bail actuating the slider moving along a front-to-back direction for detaching the electronic module from a receptacle module.