SOLVED: USB for wireless Logitech keyboard lost. - Logitech Harmony Smart Keyboard - iFixit
Wireless Usb Receiver Dongle 6 Channels Adapter For Logitech Unifying Keyboard K400/mouse Mx M905 M510 Repair Replacement - Instrument Parts & Accessories - AliExpress
Amazon.com: Logitech USB 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
Replacement 6 Channel USB Receiver Dongle For Logitech Unifying Keyboard/Mouse | eBay
USB Dongle/Receiver For Logitech K800,K750,K710,K700,K520,K400,360 Unifying | eBay
Amazon.com: Logitech USB 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