| http://www.w3.org/ns/prov#value | - For example, in one embodiment the engine charges secondary batteries that power the light-emitting diode 250.In some embodiments, the circuitry 248 includes a processor, a logic module, memory, and internal and external interfaces coupling the circuitry 248 to other components, such as interfaces that couple to the detector 246, the display, and the button 252.
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