Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech MX Anywhere 2 Wireless Mobile Mouse – Track on Any Surface, Bluetooth or USB Connection, Easy-Switch up to 3 Devices, Hyper-fast Scrolling : Electronics
FreeKB - Logitech Resolve "There is no Unifying receiver plugged into your computer"
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ABOUT MX ANYWHERE 2
Review: Logitech MX Anywhere 2 does multi-device mousing right