This is a USB 3.0 A (male) to Micro-USB 3.0 B (male) cable. It was designed for data transfer and charging devices. This product is compatible with Samsung Galaxy Note 3, Western Digital My Passport Essential, Seagate External Hard Drives, and other external hard drive devices that use the same type of connection. The transfer speeds of this charging transfer cable is 5 Gbps. Our cable is RoHS compliant and backwards compatible with USB 2.0/1.1.