Responses
Mc can't take it with him on missions because it's not given to him by center. Center one color is blue and siri(forgot mc's alt name) is red. So the ml made a earbud that can switch between center and siri and is on his way to deliver it to mc. In the next few chapters
Ohhhh, okay. Thank you for explaining it(=・ω・=)
Wait, he's not using the earbuds? When did he stop using it? Or he's still using? I'm so confused about this earbuds(╯°Д °)╯