Two tablets type magnetic ring also said, block button type magnetic ring, buckle type magnetic ring, clip buckle type magnetic ring, clip buckle magnetic ring, or is assembled type magnetic ring, is ferrite nickel zinc magnetic ring series in the of a. is in recent years development up of new of cheap of interference inhibit devices, its role equivalent to low pass filter, better to solution has power line, signal line and connection device of high frequency interference inhibit problem, and has using simple, convenient, effective, occupied space is unlikely to, series advantages, with Assembly type magnetic ring to inhibit electromagnetic interference (EMI) Is the economical, simple and convenient and effective method.