A power control circuit is provided containing a switch array, which includes segmented switches, a flying capacitor, an output voltage terminal, a feedback loop, and a digital voltage regulator block. Each material is etchable at a faster rate than the other in the presence of different etchant such as for an organic polymer and an inorganic low k material. In some embodiments of the invention, the closure is rotatably mounted on the container body, and has a dispensing opening in the closure base wall for selective registry with the dispensing opening in the top wall of the container body. The linear transition duct may include an outlet with exhaust mouths that are configured such that sides of the transition duct are coplanar with adjacent transition ducts, thereby eliminating destructive turbulence between adjacent, linear transition ducts. A response is transmitted from the other relay device to the server device, and further relayed to the relay device. The analyzed data may include an indication of a usage pattern associated with the mobile computing device.