An arrangement in a network device for facilitating multiple connection speeds with a network is provided. Accordingly, in the conventional processing in which rate of change in gradation is improved by making a drive voltage of liquid crystal at the time of change in gradation larger than normal liquid crystal drive voltage to increase response rate of the liquid crystal panel, interference component is also emphasized. At least one of the electrodes is disposed between at least two dielectric layers disposed above and below the at least one of the electrodes. The second key module comprises a plurality of lateral keys located on one of two opposite lateral surfaces of the housing. The light-emitting layer has a stacked-layer structure including a first light-emitting layer and a second light-emitting layer, and the first light-emitting layer contains a higher proportion of the second organic compound than the second light-emitting layer. A nozzle guard is positioned over the printhead chip.