The invention relates to a display element with an energy source having a display and a processor/memory. The energy source supplies energy to the display and the processor/memory, and the processor/memory can display data via the display. The display element has a receiver for longitudinal waves which is connected to the processor/memory in order to supply received waves as data to a processor/memory. As a result, a display can be provided which can be variably used, is reliable and is adaptable such that it can be centrally controlled.
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