This technique was created by the hunter-nin of Kirigakure and according to Ao, they are the only ones who know how to cancel the technique. When a specific part of the user's body is targeted, this technique is automatically activated. The talismans move to cover the specific body part and form a barrier to protect it.
Ao wears these talismans as earrings as a precaution should anyone try and target the Byakugan in his right eye socket. These talismans have the kanji for a humble form of "to hear" (承, shō, uketamawa(ru)) on both sides.