Amplifier Jack

Amplifier Jack (ジャック) is a set of support items invented by Power Loader for Kyoka Jiro's costume upgrade.

Description
Kyoka’s Amplifier Jack are two small speakers that Kyoka wears on both her forearms. 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.

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.