A system for picking-up a user's voice, having an earpiece (10) that has a shell (12) and is to be worn at least partly in the user's ear canal (18), an elongate C-shaped bow-like retention element (14) attached to the shell for retaining the shell within the user's ear (18, 66, 68) and an ear microphone (16) oriented acoustically inwardly towards the user's ear canal for picking-up the user's voice. The material and the dimensions of the retention element are selected such that the retention element can be brought into engagement with the user's concha (68) by manual plastic deformation by the user.