Patent ID: 8842863

Claim:
A hearing aid comprising a power supply means; at least one microphone for transforming an acoustic signal in the surroundings of a hearing aid user into an electric signal; a base part to be arranged outside the ear canal of a hearing aid user, said base part comprising signal processing means; an ear plug part to be arranged in the ear canal of a hearing aid user, said ear plug part comprising acoustic transmitting means for transmitting sound into the ear canal, an ear canal microphone for transforming an acoustic signal in the ear canal into an electric signal, and an electronic module connected to said ear canal microphone; and an elongated member connecting said ear plug part with said base part, said elongated member comprising electrical wires adapted for providing power supply from the base part to the ear plug part, or, from the ear plug part to the base part, wherein the signal from the ear canal microphone is transferred to the signal processing means in said base part by a one line bidirectional serial databus connected through a data line arranged in said elongated member.