The Lexar Professional USB 3.0 Dual-Slot Reader (UDMA 7) is a memory card reader equipped with a USB 3.0 interface supporting data transfer rates of up to 500MB/s. That's up to five times faster than USB 2.0 speeds. Achieve a maximum read speed of 150MB/s with the fastest compatible memory cards: CF 1000x. The reader is also backwards compatible with USB 2.0 devices. It supports UDMA (Ultra Direct Memory Access) 7 cards, which feature substantially accelerated speeds. Compatible card formats include CompactFlash (CF), SDXC / SDHC UHS-I (Ultra High Speed Class 1), and SD.