A communication system provides for an informing of participants in a Push-to-Talk over Cellular communication session that the session is being recorded by a recording device, for a storage, by the recording device, of media that conveyed during the session, and for a subsequent retrieval of the stored media from the recording device. The mobile electronic display system includes a display element and a power source. The serving device comprises a sequencer to originate environment attributes and commands to be executed within the environment. Wheels are associated with each leg to render the system mobile. The diameters are chosen such that the DLC surface is removed in specifically designed time increments, such as 5 seconds, from array to array, where projecting test features with the DLC surface removed appear as bright white, while the arrays with test features that retain some DLC surface are significantly darker.