Description: -Clip on ferrite bead cable can be used on all kinds of wire cords such as: Power Cord, Audio Cables, AV Cable, Data Cable, USB Cables.-It helps improving the electromagnetic field and signal quality around the cable, avoiding outside interference.-It won't cause distortion of the transmitted signal and won't affect your audio, video and picture quality. Note:Please install them in place near the interference source. (Near the import and export of shielding case as much as possible.) If a cable has equipment that needs to be protected on both sides, install one at each end. Identifying and troubleshooting affected and offend devices are necessary for successful installation. Specification:Model: Φ11mmColor: BlackFit Cord Diameter: 11mm (0.43")Size: 20 x 32mm (0.79" x 1.