Communication unit comprising a housing (1) in which at least one transducer is placed, and on which a microphone arm (2) is suspended. The housing also has an ear hook (6) for fastening the communication unit to the head of a user. The microphone arm (2) is pivotally connected to the housing (1) by a hinge link (3, 4, 5) at an outer area of the housing, and so that the microphone arm (2) can be moved between a position in which it lies up against the housing (1), and a position in which it extends away from the housing. The microphone arm has a length, which in the main is less than or of the same order as the greatest extent of the housing, so that in the folded-in state the microphone arm does not project out over the circumference of the housing. The communication unit can be used on both the right and the left side of the head, in that the ear hook (6) can be suspended in two different positions.