the cable can let the usb 3.0 20 pin device connected to the usb 2.0 motherboard ， such as cd-rom ， floppy drive panel.<br /><br />features:<br />1. <br />2. data speed: 480mbps for usb 3.0 device.<br />3. let your usb 3.0 20pin device connected the usb 2.0 motherboard.<br />4. length:12 cm.<br />5. weight: 6g<br /><br />package included:<br />1 x usb 3.0 to usb 2.0 cable