UCEC Multiple USB 2.0 Couplers - Include A & B & MicroB & Micro & Mini Interface - Male Female Adapters - Pack of 39 39pack Mix Adapter --- Applicable to common mobile hard drives, laptop computers, use a different cable equipment. Can Meet Almost all USB2.0 Adapter you need. Super Speed Connection --- USB 2.0 Super Speed, data transfer speed about 480MB/S. Plug & Play --- Can easily be connected with computers and other equipment for data communications, file transfers, etc. Solve Connect Trouble Backwards Compatible USB2.0/1.1/1.0. Minimalist Design --- Tiny, lightweight, durable adapters, convenient to take with you wherever you go, great gift for your family and friend. Package Contents --- USB male to female adapters, male to male adapter, female to female adapter, male to micro b, etc.