SD and Micro SD Card are widely used, especially for camera, smartphone, tablets, camcorders, home cam and many more. Y-9321 is a card reader for SD Card and Micro SD Card, which allows user to read or transfer data in the memory card to computer. With USB3.0 SuperSpeed data transfer, it significantly increases the data transfer speed. This card reader is USB powered, no battery or external power needed. It’s simple and small, easy to use and carry.