The empty input terminal of an audio instrument serves as an antenna， and serves as a source of mixing of a noise， By equipping with a short plug the empty terminal which makes circuit operation of apparatus unstable and causes sound quality degradation， the noise mixed from the empty terminal prevents noise this evening， and realizes improvement in a S/N ratio or auditory lateralization， and reduction of distortion or a feeling of muddiness. By the seismic control structure which was excellent in brass+2017S aviation level aluminum alloy + natural crystal， reinforcement and the vibration suppression effect of the tag block of apparatus， and generating of a short pin besides exertion， a peculiar character like a protection cap， or incidental sound are absolutely none. In addition to the conventional special vibration suppression sheet， it is attached and the price defers quartz watch resonator QR-8. Cautions: Please do not connect with an output terminal by any means! It becomes a cause of failure. / Material: Brass + aviation level aluminum alloy gilding specification (eight-piece ON) /