A power supply device includes an electric storage unit connected to a main power supply and a load via a charging circuit; and a control circuit connected to the main power supply, the charging circuit, a voltage detection circuit, and a current detection circuit. A multiple device key exchange is utilized to create a session key for encrypting the content material that is based on each of the public keys of the plurality of destination devices. A heat exchange device may be adjacent to the hinge device in an area between the base and the lid. At least one processor is provided for processing the at least one calibration factor for adjusting the measuring for compensating for the errors when measuring the at least one parameter of electrical energy. The server may also execute one or more plugins that customize the configuration files as desired.