In a vehicle air is compressed for being used in the brake system of the vehicle, for instance. A method includes contacting at least a portion of the semiconductor material with a passivating agent. In the second light-emitting element, a first transparent electrode layer is in contact with the reflection electrode layer, the light-emitting layer is in contact with the first transparent electrode layer and the transflective electrode layer. During standby mode, the samples are gathered during paging slots assigned to the mobile.