Facility comprising a first mobile component and comprising a further mobile component, wherein the first mobile component has a first controller and the further mobile component has a further controller, wherein the first mobile component has a light transmitter that can be actuated by the first controller, wherein the light signal of the light transmitter is modulated in order to transmit a piece of identification information that is related to the first mobile component and can be decoded by the controller, wherein the first mobile component has a sound transmitter that can be actuated by the first controller at the same time as the light transmitter, wherein the further mobile component has a light receiver that can be connected to the further controller, wherein the further mobile component has a sound receiver that can be connected to the further controller, wherein the further controller is suitably configured for determining the time difference between the arrival at the sound receiver of a sound signal emitted by the sound transmitter and the arrival at the light receiver of a light signal emitted by the light transmitter, wherein the identification information is modulated onto the light signal and onto the sound signal, wherein a full-duplex method or a half-duplex method is used, wherein the distance S between the first component and the further component is determined in accordance with S = T _ diff * v _ sound where v_sound is the speed of sound, where T_diff is the determined time difference between the arrival of the light signal at the light receiver of the second device and the arrival of the sound signal at the sound receiver of the second device, wherein the sound receiver is suitably configured for detecting the amplitude of the sound, and for determining, for the determined distance S, a value for the sound amplitude from a table, in particular using the controller, in particular by interpolation, said table assigning particular sound amplitudes to particular distance values, and for carrying out a plausibility check on the determined distance S by monitoring the detected sound amplitude in case it exceeds a permitted degree of deviation. wherein the first mobile component has a light transmitter that can be actuated by the first controller, wherein the light signal of the light transmitter is modulated in order to transmit a piece of identification information that is related to the first mobile component and can be decoded by the controller, wherein the first mobile component has a sound transmitter that can be actuated by the first controller at the same time as the light transmitter, wherein the further mobile component has a light receiver that can be connected to the further controller, wherein the further mobile component has a sound receiver that can be connected to the further controller, wherein the further controller is suitably configured for determining the time difference between the arrival at the sound receiver of a sound signal emitted by the sound transmitter and the arrival at the light receiver of a light signal emitted by the light transmitter, wherein the identification information is modulated onto the light signal and onto the sound signal, wherein a full-duplex method or a half-duplex method is used, wherein the distance S between the first component and the further component is determined in accordance with S = T _ diff * v _ sound where v_sound is the speed of sound, where T_diff is the determined time difference between the arrival of the light signal at the light receiver of the second device and the arrival of the sound signal at the sound receiver of the second device, wherein the sound receiver is suitably configured for detecting the amplitude of the sound, and for determining, for the determined distance S, a value for the sound amplitude from a table, in particular using the controller, in particular by interpolation, said table assigning particular sound amplitudes to particular distance values, and for carrying out a plausibility check on the determined distance S by monitoring the detected sound amplitude in case it exceeds a permitted degree of deviation.