An object is to provide a structure in which when a waterproof filter having an adhesive layer 1 attached thereto is attached to a housing of an electronic device, the adhesive layer 1 hardly rides onto a stepped portion 13. One embodiment provides a top surface. Another aspect of the invention is the implementation of embodiments of a systematic code on interactive devices, thereby enabling efficient communication using such interactive devices. The content can be transferred to the recipient if the recipient memory device has the specified properties.