A shared \u201cuniversal\u201d virtual shopping cart may be provided by a host to enable information sharing between multiple disparate electronic marketplaces provided by various merchants. The IF mixer is arranged downstream of the at least one analog signal processing component. The pixel color determining unit determines whether a color of each pixel is a specific color based on the detected pixel values. A media configurator is adapted to communicate with the media configurator control module and the media relay. The fluid in the inlet-side space has a high pressure, and the fluid in the space between the cap and diaphragm has a low pressure.