A communication device includes storage configured to store information, an output device configured to output the information, a power supply detector configured to detect a supply of power to the communication device when the communication device is coupled to an external power source. The first insulating film may be formed to cover the upper surface and side wall of the conductive pattern. The ultrasound source and the reflecting unit constitute a resonance cavity. The retaining member is attached to a spring that has one end connected to the retaining member and an opposite end attached to the kidney dialysis machine. Also, an adjustable screw for an interface as described above. This method enables to prevent the whole remaining patterns from shrinking even when fine patterns beyond the resolving power in lithography technologies are formed.