noun which may take the genitive case particle 'no', noun
automatic; self-operating
Describes devices or mechanisms that operate automatically, often contrasted with manual types. Commonly used in compound nouns like 自動式ドア (automatic door).
このビルには自動式のドアが設置されている。
This building is equipped with automatic doors.
自動式の消火器は火災を感知すると作動する
Automatic fire extinguishers activate when they detect a fire.
手動式 means 'manual type', the opposite of 自動式.
Compound of 自動 (automatic) + 式 (type, style).