A system with a contactless user-interface configured for a user's controlling a functionality of the system through contactless interaction with the contactless user-interface, wherein: the contactless user-interface has a detector sub-system and a user-feedback sub-system; the contactless user-interface is configured for operating in one of: an alert mode and a control mode; in the alert mode, the contactless user-interface is configured for controlling the user-feedback sub-system to provide an acknowledgement to the user, in response to the detector sub-system having detected a presence of the user within a pre-determined alert range; the contactless user-interface is configured for transitioning from the alert mode to the control mode in response to the detector sub-system detecting a pre-determined initialization gesture made by the user within the pre-determined alert range; and in the control mode, the contactless user-interface is configured for controlling the functionality in response to the detector subsystem detecting a pre-determined control gesture of the user carried out within the pre-determined alert range; wherein the system has an additional user-interface; and the additional user-interface is configured for user control of an additional functionality of the system through physical contact with the additional user-interface; characterized in that the detector sub-system is configured to detect a main vector component of a vector representing a gesture of the user as a directed path within the pre-determined alert range, and the detector sub-system is operative to inactivate user control of the functionality via the contactless user-interface upon detecting that the directed path lies in the direction from the user towards the additional user-interface, and that a rate of change of this main vector component exceeds a pre-determined threshold magnitude. the contactless user-interface has a detector sub-system and a user-feedback sub-system; the contactless user-interface is configured for operating in one of: an alert mode and a control mode; in the alert mode, the contactless user-interface is configured for controlling the user-feedback sub-system to provide an acknowledgement to the user, in response to the detector sub-system having detected a presence of the user within a pre-determined alert range; the contactless user-interface is configured for transitioning from the alert mode to the control mode in response to the detector sub-system detecting a pre-determined initialization gesture made by the user within the pre-determined alert range; and in the control mode, the contactless user-interface is configured for controlling the functionality in response to the detector subsystem detecting a pre-determined control gesture of the user carried out within the pre-determined alert range; wherein the system has an additional user-interface; and the additional user-interface is configured for user control of an additional functionality of the system through physical contact with the additional user-interface; characterized in that the detector sub-system is configured to detect a main vector component of a vector representing a gesture of the user as a directed path within the pre-determined alert range, and the detector sub-system is operative to inactivate user control of the functionality via the contactless user-interface upon detecting that the directed path lies in the direction from the user towards the additional user-interface, and that a rate of change of this main vector component exceeds a pre-determined threshold magnitude.