The LEN L4KGI03 is designed for use with full 12G/4K UHD SDI video as well as lower standards including 6G, 3G, HD and SD SDI. Use the L3GGI03 with 3G, HD or SD SDI signals while the LHDGI03 may be used with HD or SD SDI (items sold separately). All units have a very high breakdown voltage, as required for medical grade applications. They are built in cylindrical plastic (for isolation) enclosures, fitted with a BNC connector at each end and an industry-standard size mounting flange is fitted on one end.