A solar cell includes a substrate, a first lightly-doped region, a second lightly-doped region, a second heavily-doped region, a first electrode and a second electrode. Third party applications on a wireless device can communicate and be controlled by a remote management server via a management client plug-in interface. Thus, the user is notified that a deterioration in the uplink speech quality occurs. The cavities are formed between the projections, with stator windings placed in said cavities. The stored information is then transmitted to a requester via the telecommunication connection. Further, the solar-radiation amount calculating means determines the solar radiation amount by correcting the detected value of the solar radiation sensor.