How do I connect the mouse using the Unifying USB receiver for the first time?
Download Logitech Options, click Add Devices, and select Add Unifying Device. Make sure the mouse is ON and extract the Unifying receiver from the battery hatch, then short press Easy-Switch to select a channel and long press to enter pairing mode. Finally, insert the Unifying USB receiver into your computer. (Page 5)
From the official Logitech M585 M590 Silent Wireless Mouse manual, page 5
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