The invention relates to a device of the build-up of pressure in supply systems to components on internal combustion engines. The gun case includes a pair of side walls with at least one of the side walls being formed with a ballistic resistant layer and one of the side walls being formed with a target indicia on an outer side thereof. The power supply circuit is also provided with a feedback line that connects the connecting line of the switching circuit and the Zener diode to each other. Data is received in response to the query, wherein the data received is based on the access criteria and the access criteria relate to an access of the wireless device to the wireless network. During microwaving, the pressure can be regulated at a relatively lower vapor transferring rate through the pre-selected area.