Connect 2 internal USB (Universal Serial Bus) 3.0 devices (internal card reader, hard drive) directly to a motherboard header connection. The USB3SMBADAP6 Internal USB (Universal Serial Bus) 3.0 Adapter Cable extends a 20-pin motherboard USB (Universal Serial Bus) 3.0 header connection & enables you to add 2 internal female USB (Universal Serial Bus) 3.0 (Type A) ports.