Logitech Unifying Receiver for Connecting Multiple Devices
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
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Restored Logitech K850 Wireless Bluetooth Keyboard PC Mac Chrome + USB Unifying Receiver, (Refurbished) - Walmart.com
Logitech K850 Wireless Bluetooth Keyboard, M585 Mouse, USB Receiver, Excellent 604947767127 | eBay
Logitech K850 Wireless Bluetooth Keyboard NO UNIFYING RECEIVER B52 | eBay
List of Logitech products - Wikipedia
Amazon.com: Logitech USB Unifying Receiver - 2 Pack : 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
New Logitech Unifying USB Receiver for keyboard K230 K250 K270 K320 K340 K350 K750 K800 - Walmart.com