A method is provided for direct communications between members of at least one communication group of wireless entities, in which two communication groups are provided. The hologram device includes a recordingreproducing controller performing a recording operation of the information concurrently with a reproducing operation of previously-recorded information, and an error detector detecting an error in the previously-recorded information reproduced concurrently with the recording operation. An anti-rotation mechanism prevents the liner from rotating with respect to the dish. The amount of detected RF energy transferred across the channel is used in determining the presence andor absence of a solid, liquid or gas. A hollow spike is also included on the housing as well as at least one metering pump The metering pump is fluidly connected to the hollow spike on the housing and to a metering pump fluid line.