Hearing aid device comprising a sensor member

A hearing aid device for improving, augmenting and/or protecting the hearing capability of a user when receiving acoustic signals from the surroundings of the user, the hearing aid device comprising

• a behind the ear (BTE) part and an ear piece connected via a tube and/or a cable,
• an input unit for generating corresponding audio signals,
• a signal processing unit for modifying the audio signals, and
• an output unit for providing modified audio signals as audible signals to at least one of the user's ears,
• the hearing aid device comprising a sensor member for detecting the movement and/or acceleration and/or orientation and/or position of the hearing aid device,
• the input unit of the hearing aid device comprises a first microphone and a second microphone, and
• a control unit for determining an angle of the hearing aid device based on measurements provided by the sensor member, said angle being defined as the angle between a line along which said first and second microphones are arranged and a horizontally arranged line, and wherein the hearing aid device is configured to determine how much the length of the tube and/or of the cable should be adjusted in order to place the hearing aid device in an optimal position.