The present invention relates to sheet-like materials suitable for use in the containment and protection of various items, as well as the preservation of perishable materials such as food items. A field generating electrode is disposed on the light blocking member and the color filter. The dynamic service may be installed in the embedded network server dynamically, thereby allowing other aspects of the embedded network server to operate without disruption. The USB plug electrically connects to a wire group and is inserted into the shell from the first opening.