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Whenever Naruto Uzumaki entered into a tailed form, the First Hokage's Necklace activated this technique to restrain him. It is unknown if the technique just restrains Naruto until Yamato is able to suppress the Nine-Tails' influence or if it suppresses the influence by itself as the Nine-Tails cancelled the technique by crushing the necklace.[2] It also alerts Yamato to how many tails Naruto develops.

References

  1. Naruto Trading Card Game
  2. Naruto chapter 438, pages 2-4