A control circuit for a generator has a control function that monitors the voltage across a bus capacitor. The optical wiring layer includes a core for propagating light, a clad for sandwiching the core, and a mirror for reflecting light propagating in the core toward an optical part mounted on the optical wiring layer, or reflecting light from an optical part into the core. Secondarily, the wrist band would be elastic, not only allowing for comfortable use, but also allowing the ability to be pulled off by stretching in emergency situations, protecting the wearer from possible severe harm. The memory is for storing a predetermined look-up table; the look-up table comprises plural kinds of edge time duties and the corresponding decoded bit combinations thereof. Reference information from the user equipment is used to process data from said user equipment.