An RJ-type plug mating with an RJ-type housing includes a plug body. The plug body includes a latching block and a latching beam respectively protruding from two opposite surfaces thereof. The latching block includes a resisting end connecting to the first surface, a front end opposite to the resisting end, and a guiding surface connecting the resisting end and the front end. The guiding surface is operable to guide the latching block to be latched into or be separated from a top of the RJ-type housing. The latching beam is operable to latch a bottom of the RJ-type housing.