A rocker switch, particularly a window lift switch in a motor vehicle, has a switch housing in which a rocker lever can be adjusted from an initial position, against a restoring force, into a switch-on position. This determination is used to define appropriate treatment and monitoring options for the patient. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain control and fine frequency stepping of the primary transceiver to produce operational frequencies of the secondary transceiver.