Clip buckle type magnetic ring dedicated Yu power line, and signal line, more unit line cable Shang of EMI interference inhibit, including power line Shang of noise and pointed peak interference, while has sucking EMI absorption magnetic ring received electrostatic pulse capacity, makes electronic equipment reached electromagnetic compatible (EMI/EMC and electrostatic discharge of corresponding international specification, using Shi can will a root more core cable or a beam more unit line cable wear Yu which. more wear once can strengthening its effect. usually with 25MHz and 100MHz frequency points of impedance value to measure magnetic ring magnetic beads of absorption characteristics.