noun
auxiliary input device
Computing term for a device that provides additional input capabilities, such as a game controller, touchpad, or specialized keyboard.
このソフトは補助入力装置に対応しています。
This software supports auxiliary input devices.
Compound of 補助 (ほじょ, 'assistance') + 入力 (にゅうりょく, 'input') + 装置 (そうち, 'device').