A switch device includes a lid arranged between a tactile switch, which is arranged on a substrate, and an operation button, which is coupled to a retainer so that the operation button can be pushed. An opening is formed in the metallic film. The locking surfaces are brought into engagement with one another by a force imparted by a spring while rotating the mounting head relative to the wiper arm from the disassembled position toward the shipping position. Protecting groups and functional groups can be designed to make purification at large scale a practical reality. On the other hand, if the sending network is at a tier equal to or above the subject tier, the message is forwarded to all networks in the system other than the sending network. According to the embodiment, in a network in which a small cell and a macro cell are overlapped and operated, the terminal can minimize battery consumption and quickly recognize the small cell.