In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. The output buffer includes a variable resistance circuit connected to a path between the first power source supply terminal and the power source line, the variable resistance circuit serving to change a resistance value thereof in accordance with a magnitude of a total sum of the currents. The message includes a request to provide a value representative of an address associated with the host and the message includes a value representative of an address associated with the remote device. When executing the application, CPU 11 reads out the download flag F corresponding to the application and displays a predetermined image on a liquid crystal display MS4 when the download flag F has a value of 1. The end portion also may be adapted to be secured to andor removed from the welding gun in a linear movement. The electricity generator assembly is controllable between an inactive rest configuration and an active configuration for producing energy in which the emergency electricity generator delivers emergency electric energy to the electric network, without being electrically powered by the electric network.