An insulating structure comprising an aerogel composite fully enclosed by an envelope and sealed at a reduced pressure, said aerogel composite comprising at least one metal oxide matrix and a fibrous material incorporated therein, and where said insulating structure can bend to at least 90\xb0 and a bending radius of less than \xbd inch without any substantial fracture. A second dielectric layer is laminated to the other side of the central core. The power supply circuit functions to limit the power supply when the input pulse signal assumes at least the ground level. A transmitting unit transmits, to the second network, the video stream of which the delivery to the second network has been permitted by the decision unit.