A method for operating one or more computing input devices in a power saving mode. The battery includes a battery authentication portion that includes battery identification information and performs authentication between the battery and the electronic device. Weights may further be situated within an interior of the support poles. The memory router stores memory partition information, which describes the memory allocated to the processor. This beam is combined in free space with a phase modulated reference beam. The constant voltage circuit includes a first error amplifier with a high direct current gain and a second error amplifier with high speed responsiveness with respect to a change in an output voltage.