An arrangement having a receiver system and a radio system; wherein the radio system has: - an energy converter for converting nonelectrical primary energy from the environment into electric power, wherein the energy converter can be excited by a mechanical operation of an operating element of the radio system, - a switching unit which is set up to convert a mechanical operation of the operating element into a logical signal and to generate a predetermined radio message therefrom, as well as - a transmission unit for sending the predetermined radio message on one or more transmission channels stored in the radio system; wherein the receiver system has a receiver and is set up to perform a method having the following steps: a.) storage of at least two reception channels in a predetermined frequency range in the receiver system, b.) presetting of the receiver to a preferred stored reception channel, c.) determination of a statistical channel availability of the stored reception channels on the basis of repeated checking of a reception signal level of each stored reception channel, d.) selection of a stored reception channel having the lowest channel availability as the preferred reception channel. wherein the radio system has: - an energy converter for converting nonelectrical primary energy from the environment into electric power, wherein the energy converter can be excited by a mechanical operation of an operating element of the radio system, - a switching unit which is set up to convert a mechanical operation of the operating element into a logical signal and to generate a predetermined radio message therefrom, as well as - a transmission unit for sending the predetermined radio message on one or more transmission channels stored in the radio system; - an energy converter for converting nonelectrical primary energy from the environment into electric power, wherein the energy converter can be excited by a mechanical operation of an operating element of the radio system, - a switching unit which is set up to convert a mechanical operation of the operating element into a logical signal and to generate a predetermined radio message therefrom, as well as - a transmission unit for sending the predetermined radio message on one or more transmission channels stored in the radio system; wherein the receiver system has a receiver and is set up to perform a method having the following steps: a.) storage of at least two reception channels in a predetermined frequency range in the receiver system, b.) presetting of the receiver to a preferred stored reception channel, c.) determination of a statistical channel availability of the stored reception channels on the basis of repeated checking of a reception signal level of each stored reception channel, d.) selection of a stored reception channel having the lowest channel availability as the preferred reception channel. a.) storage of at least two reception channels in a predetermined frequency range in the receiver system, b.) presetting of the receiver to a preferred stored reception channel, c.) determination of a statistical channel availability of the stored reception channels on the basis of repeated checking of a reception signal level of each stored reception channel, d.) selection of a stored reception channel having the lowest channel availability as the preferred reception channel.