A portable device is provided and includes an earpiece including a receiver configured to convert an electric signal into a sound signal and an ear mold configured to be coupled to the earpiece. The ear mold including cylinder formed about a first axis of the ear mold and including an inner side and an outer side, a first cap extending from one end of the cylinder and a second cap disposed adjacent to the first cap and extending parallel in relation to at least a part of the first cap, wherein the first cap has a first hole passing through a first side of the first cap and a second side, which is disposed opposite the first side, and the second cap has a second hole passing through a third side of the second cap and a fourth side, which is disposed opposite the third side.