The Lexar 2-in-1 USB 3.1 Multi-Card Reader offers transfer speeds of up to 312 MB/s (reads up to 5 times faster than USB 2.0) for SD and microSD. It is also backwards compatible with UHS-I (up to 170 MB/s), which greatly improves your workflow. The Lexar 2-in-1 Card Reader has the capability to read from both card slots simultaneously. It also allows easy file transfer from one card to another, providing even more flexibility.