A system, more particularly a hearing aid, consisting of a microphone and a preamplifier, wherein the microphone comprises a housing having therein an opening to the surroundings, a diaphragm and a backplate, while the amplifier is coupled to the system consisting of the diaphragm and the backplate and has a field effect transistor as input element. The system also includes a tag generation unit configured to generate a client tagged data based on the set of tagging rules. This has an effect of reducing packet loss and preventing packet disordering while a mobile host exchanges traffic in a mobile network. When the categorizing map is displayed, since only necessary leaves are displayed, the visibility and operability of the system are improved. The second polyimide can also include the polyimide powder at a weight ratio less than about 20 wt % of the total weight of the second polyimide layer.