This DataLine Surge Protector protect your BNC network port against power surges. It works with ethernet and IBM applications such as AS/400 and System 3x equipment. It has extremely sensitive, state of the art avalanche-diode technology. It has high speed throughput, automatic reset after surge, rugged & stylish with easy In-Line installation and negligible signal loss. (Connectors: BNC Female to Female; Surge Capacity: 7.5v)