The capacity of a compressor in cleaning operation is set based on a Froude number Fr. Semiconductor ceramic layers made from a semiconductor ceramic containing barium titanate as the main component and the element nickel at about 0. The target vehicle data includes a braking capability value of the target vehicle. Authorization is granted in the event the playback of authorization data via the user interface of the first playback device matches the playback of reference data via the user interface of the second playback device, and modifications of the playback attributes are, in essence, time-synchronized.