Security Tag how to open?

First of all we need to know about locking principle of supermarket chain: nail two small grooves on the pole when pulled the nail out of alarm after bottom insert the buckle, pull the four small steel balls will take advantage of slid into the location Groove on the nail, and ball above a hoop at the top under the pressure of the spring firmly stuck in the Groove of the them. So in order to get nails from bottom out, brute force is no way open the security tag.

Then one must know the supermarket chain to unlock principle: when the alarm button at the top the top when subjected to strong magnetic, magnetic Hoop and small steel balls on the suction and compression spring moves, and nails can be easily removed from the mouth.