noun
adaptation equipment; connectivity device
Technical computing term for hardware that enables connection or adaptation between different systems or interfaces.
この接続機器を使えば、古いプリンターも新しいパソコンにつなげます。
With this adaptation equipment, you can connect an old printer to a new computer.
周辺機器 refers to peripheral devices in general, while 接続機器 specifically emphasizes the connecting or adapting function.
Compound of 接続 (connection) and 機器 (equipment, device).