A plurality of sensors for receiving arrival light detect the change ranges of light amount distributions generated upon the pointing operation of a pointer on a coordinate input region. The electroluminescent polymer includes host monomers required to produce a highly efficient host material for blue, green, and red colors, and has high functionality, such as high solubility, thermal stability, and quantum efficiency. If the user is looking at the display screen, the electronic device adjusts a font size of a font being displayed on the display screen. Providing the knowledge to every student to master hisher emotional intelligence. , and a power generating element including an electrolyte, a positive electrode and a negative electrode containing at least one of aluminum and aluminum alloy, and the power generating element provided in the closed space.