Anime and Manga DifferenceEdit
In the anime, the ID is a bracelet which every resident of No.6 has. They can communicate and receive messages through it.
Known People Using Them Edit
Shion - Used to wear on his left wrist. Discarded it when he and Nezumi fled from the Bureau officials. ID Number - QW-55142
Safu - Disabled when taken in for Elyruias sample. ID Number - SSC-000124GJ