Knowledge That Only Experts Know： The contact shrapnel is made of high-elastic, high-conductivity copper. After 10000 times plug & unplug test, the shrapnel contact resistance is still less than 15mΩ, this is very important for adapter. USB 3.0 male to female：Extend a usb port for your usb device, to prevent the original port of your computer from being unstable due to multiple uses, it can also be used to extend the length of 2 short USB cables. SuperSpeed:USB 3.0 max transfer rate up to 5Gbps (Theoretical speed)** NOTE: The actual transmit speed depends on the interface and device connected, if it connect to the USB2.0 interface, or your device can only support 2.0, then it can only reach the speed of USB2.0) Compatibility:USB 3.0 adapter fits for computer, USB network card, hard drive, printer, camera, u disk and more. Portable:Compact and lightweight design, you can put it at everywhere.2 Packs usb coupler save time & money.