A call-forwarding system can be remotely controlled in a simple and easily understood manner, thereby increasing the usage of call-forwarding. The first side panel is attached to the central panel and has a first aperture formed therein. A sound controller outputs a sound control signal based on an input of the operation amount and based on the revolution speed. A composite interbody bone implant device is also provided including a body skeleton having a non-bone composition, such as a polymer, formed into a shape and including one or more cavities which can be filled with other material, for example, allograft material.