Logitech Unifying Receiver for Connecting Multiple Devices
SOLVED: USB for wireless Logitech keyboard lost. - Logitech Harmony Smart Keyboard - iFixit
Lost your Dongle? - Bangkok Patana School
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics
Amazon.com: Universal USB Receiver Replacement for Dell Wireless Keyboard Mouse KM714 KM717 WK717 KM636 WM514 WM326 WM126 WM527 : Electronics
Amazon.com: USB Dongle Mouse Receiver Adapter Replacement for Logitech G502 Lightspeed Wireless Mouse : Electronics
$50 is pretty cheap but has no usb dongle as they lost it : r/MouseReview
Amazon.com: New Logitech Unifying USB Receiver for Mouse MX M905 M950 M505 M510 M525 M305 M310 M315 M325 M345 M705 M215 : Electronics