Abstract: The object is to ensure that device signals intended, for example, to inform hearing aid wearers about program changes or the end of a battery's life are perceived independently of ambient noise. Provision is therefore made, for instance, for reducing the level of the input signal with the aid of a gain adjuster (12) so that a device signal from a generator (4) driven via a control element (6) such as, for example, a program-changing switch, and via a control logic (5) can be perceived. Other possible solutions are to change the level of the device signal as a function of the level of the input signal or to mute the input signal while the device signal is fed out.

Abstract: The object is to ensure that device signals intended, for example, to inform hearing aid wearers about program changes or the end of a battery's life are perceived independently of ambient noise. Provision is therefore made, for instance, for reducing the level of the input signal with the aid of a gain adjuster (12) so that a device signal from a generator (4) driven via a control element (6) such as, for example, a program-changing switch, and via a control logic (5) can be perceived. Other possible solutions are to change the level of the device signal as a function of the level of the input signal or to mute the input signal while the device signal is fed out.

Abstract: The batteries used to supply voltage in th hearing aid devices are subject to a self-discharge. This is in particular relatively likely given a zinc-air battery. Oxygen that is supplied from outside via the surrounding air is required for the progression of chemical processes in the zinc-air battery. The invention provides a way by which, given a battery inserted in a hearing aid device, a gas exchange between the battery and the surrounding air can be prevented. If the oxygen supply to the battery is stopped, the self-discharge process also comes to a halt. The battery must not therefore be removed from the hearing aid device to prevent the self-discharge, and the hearing aid device also remains ready for use after a long period without use.