My Hero Academia Wiki
My Hero Academia Wiki

Amplifier Jack (音響増幅 (アンプリファー) ジャック Anpurifā Jakku?) is a set of support items invented by Power Loader for Kyoka Jiro's costume upgrade.


Kyoka defends her class from Trajectory: Crescent Moon.

Kyoka’s Amplifier Jack are two small speakers that Kyoka wears on both her forearms.[1] When she plugs in her Earphone Jack's into the devices, she can amplify even further the sound and vibration of her heartbeat, releasing powerful sonic waves into anything she touches with her wrist amplifiers. The sound waves produced are strong enough to break up the ground. [2]

Kyoka can remove the sound-amplifying items from her forearms using her Earphone Jack, and aim them towards a specific target, channeling a loud heartbeat.[3]


  1. My Hero Academia Manga and Anime: Chapter 99 and Episode 52.
  2. My Hero Academia Manga and Anime: Chapter 104 and Episode 54.
  3. My Hero Academia Manga: Chapter 208 (p. 8).

Site Navigation