An inkjet ink comprising at least one dye having a heterocyclic ring and a metal ion in an aqueous medium, wherein the ink jet ink further comprises a compound capable of accelerating aggregation of the dye in the aqueous medium. The first phase, for instance, may contain one or more polyoxymethylene polymers. A first power line is coupled with the first switch. A couple of fully opened position stop members is provided and is engaged with the accelerator pedal when the accelerator pedal is rotated to a fully opened position. When a specific device is chosen, the corresponding solenoid valve is activated to connect the input sip-and-puff port to the pneumatic output port.