Pools of a plurality of types of storage devices are configured and are included in different layers. It can also be a stand alone GPS system as well. Images associated with the two display portions are slightly different from each other. Diodes are connected in parallel to respective battery cells on the highest and lowest potential sides in a forward direction from a negative electrode toward a positive electrode. Examples of categories: pre-meal BG tests, post-meal BG tests. The nozzle includes an inner body, coupled to the tubular body, surrounded by a flexible outer cover.