Accessory board provides your MCU system a USB HOST port
Overview
The SL811 USB Board is an accessory board that features a USB Host/Slave controller SL811, USB Type A receptacle, and pinheaders connected to control interface. It provides your microcontroller prototype system a USB HOST communication interface, makes it possible to read/write USB flash drive, catch movements of USB mouse, etc.
Features
SL811, USB type A receptacle, control interface
Photos
Dimensions

Downloads
Development resources: demo codes, schematic, datasheets, etc.
Wiki:
www.waveshare.com/wiki/SL811_USB_Board