SanDisk SD UHS-I Card Reader - SDDR-C531-GNANN - Fast UHS-I transfer speeds of up to 170 MB/s (performance may be lower depending on host device, interface, usage conditions and other factors. 1MB = 1, 000, 000 bytes) - With USB 3.0, move content up to 10x faster than USB 2.0 readers (transfer to drive up to 10 times faster than standard USB 2.0 drives (4MB/s); USB 3.0 port required. Based on internal testing; performance may be lower depending upon host device) - Backwards-compatible with USB 2.0 in case you need it - Compact and durable for worry-free portability