The SP303 DataLine Surge Protector protect your CATV/CCTV video port against power surges. Perfect for cables and set-top box, TV or VCR with coax line. It has extremely sensitive, state of the art avalanche-diode technology. It has high speed throughput, automatic reset after surge, rugged and stylish with easy in-line installation and negligible signal loss. (Connectors: F59 Female to Female; Surge Capacity: 7.5V)