"We offer a wide variety of personal computer internal power cables for your case cooling requirements. Whether you have a 4-pin or a 3-pin fan, we have the cable you need. Add, split, or extend your internal 3-pin power products with genuine Cables To Go internal 3-pin power cables. Connector: One 3-pin Male to One 4-pin Male. Converts 3-pin fan connector to standard 4-pin power connector. Designed for CPU and case fans."