Wireless usb adapter overview, Interface, Led description – HiRO H50191 User Manual
Page 4: Wps button

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Wireless USB Adapter Overview
Wireless USB Adapter has the USB interface, LED and WPS button below.
Interface
USB Interface: Connect the USB Interface to a USB port on your computer.
LED Description
LED: The LED stays lighted to indicate WLAN link established and active.
WPS Button
WPS Button: Press this button to do WPS with AP.