The disclosure relates to a hearing device comprising a housing configured to be at least partially inserted into an ear canal of a user, the housing having an opening leading to an interior space enclosed by the housing; a slidable member moveable relative to the opening between different positions including a first position and a second position; an actuator configured to actuate the movement of the slidable member forth from the first position to the second position, and back from the second position to the first position; and a controller configured to control the actuator. The disclosure further relates to a hearing system comprising the hearing device and a stationary device, and a method of operating the hearing device.