Anti-interference magnetic ring magnetic pass, also said absorption magnetic ring, and said ferrite magnetic ring, also said anti-interference core, also said magnetic ring magnetic pass, is ferrite magnetic ring series in the of a. directly sets in USB line data line AV line video line audio line Shang, improve signal quality, and shield radiation. especially sets in mouse, and keyboard near computer end, effective of inhibit electromagnetic radiation, line beam diameter 2.5 mm following of can winding 2 circle effect better.