A photo-voltaic charger has a body with grips extending from a central region. When generating a periodic billing statement, the invention determines a consumer’s eligibility to elect early payment, deferred payment, and regular payment. A second container of the system is in fluid communication with the first container for receiving liquid solution formed in the first container. It is possible to use a liquid crystal material having large spontaneous polarization, and a high-speed response is realized even when a low voltage is applied to the liquid crystal material. The identifier field includes a local AP identifier identifying the AP when the reception target indicator indicates that the target of the PPDU is the station.