The present invention refers to a headset with a Bluetooth device comprising an ear loud speaker (3) with connection means (4) for connection to a detachable ear unit (5, 5a, 5b). The Bluetooth device is equipped with an extra microphone (14) for receiving ambient sound, the microphone is provided with a sound attenuator (15). The invention also refers to an ear unit (5) for an ear loud speaker (3) of a Blue-tooth device. The ear unit (5) being adapted to be fixed onto the ear loud speaker (3) and to be inserted in the user's ear. According to the invention the ear unit (5) is made to be inserted in the auditory canal of the ear and to abut tightly against the auditory canal. The ear unit (5) has a through bore (6) which, when the ear unit (5) is inserted into the auditory canal, extends in the length direction of the auditory canal. The bore (6) is equipped with handle means (1 1, 13) for shape conformed fixation to the ear loud speaker (3).