A radio communication device capable of specifying an arbitrary antenna gain even when an antenna having such an arbitrary antenna gain is connected is configured as follows. In one embodiment, the device includes i) first and second substrates facing each other, wherein first and second electrodes are formed on the first and second substrates, respectively and ii) an electrolyte inlet formed to pass through the first substrate and configured to receive an electrolyte. A tab and groove helps transfer the weight of the load on the castor away from the arms of the yoke and onto the wheel. A bottom cover is secured at a bottom of the sidewall. The all-digital display system further comprises one or more display screens operable to receive the modulated signals communicated from the light modulating chips.