A dual fluid cartridge for storing and dispensing fluids in unequal ratios is disclosed. The interlayer has a thickness not less than 500 nm and not more than 2,000 nm and an average refractive index greater than a refractive index of the light-emitting layer. The head includes an expansion plate and a door coupled to a central plate. The system also identifies the customer identifier associated with the packet-switched network identifying information and selects by the network switch one of the plurality of circuit-switched networks for receiving the telecommunications traffic based on the routing table and the identified customer identifier.