A color electrophotographic image forming apparatus is usable with process cartridges that each include an electrophotographic photosensitive drum. The mobile system comprises a measuring unit configured to measure the status of the radio channel used for the transmission of information. The integrated circuit is operative for driving at least one multi-color light emitting diode indicative of smart card transactions between the smart card and a USB port of the host and operative for modulating the multi-color LED based on operational attributes of the smart card andor transactions between the smart card and USB port of the host.