Lexar's multi card 2 in 1 usb 3.1 reader is designed for high speed and reliable data transfer. The uhs ii sdxc and microsdxc uhs ii card slot can be used simultaneously and the unit offers data transfer from card to computer and card to card, helping you streamline your workflow. The uhs ii slots support transfer speeds of up to 312 mb s, but is backwards compatible with uhs i media, offering transfer speeds of up to 170 mb s. The unit can be connected to your computer or laptop via the fast and reliable usb 3.0 type a port connection.