GC Electronics' 30-9549 is a modular telephone extension cord, offering a reliable connection solution for telephone systems. These cords are available in a range of lengths, from 6 feet to 100 feet, and various colors including ivory, black, and white. They are commonly used in offices, homes, and other environments where telephone connectivity is required. The cords feature modular plugs for easy and secure connections, ensuring a stable and clear communication link. BU designations indicate packages of 10.