Connector type : SMA Female to BNC Female Jack RF(Radio Frequency) Coaxial Adapter Low Loss.Matiarial : 50-ohm impedance, low loss, copper material with gold-plated surface for great connectivity and durability.Performance : Designed for low-loss performance with 50-ohm impedance; >1000 times mating lifespan. Handy items when changing types of connectors during installations.These sdi couplers are used in conjunction with an assortment of CCTV camera installations, security alarm systems, sdi monitors, DVR Recorder, Image Audio Transmitter Receiver, and surveillance audio cables. ABONIX BNC Female to SMA Female Coax Connector (Pack of 2)