A portable medication delivery system enables a patient to elect slow continuous auto-administration or rapid bolus self-administration of a fluid medication. The external power apparatus is pluggable and supplies direct current between 5 and 1. Based on the received type data, a posting payment amount is determined. At least two regions having thicknesses different from each other are formed on the crown portion, and the area of the thinnest region of the regions having thicknesses different from each other in the crown portion is larger than that of the thickest region.