New Logitech Unifying USB Receiver for keyboard K230 K250 K270 K320 K340 K350 K750 K800 - Walmart.com
How to Pair Logitech Mouse /Keyboard with Unifying Receiver - YouTube
Logitech MK540 Advanced Wireless Mouse and Keyboard 920-008671
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Logitech MK540 Advanced Wireless Keyboard and Mouse Combo for Windows, 2.4 GHz Unifying USB-Receiver, Multimedia Hotkeys, 3-Year Battery Life, for PC, Laptop | Five Star Office Supply
Logitech Standalone USB Unifying Receiver (910-005235)
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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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Logitech K540 Wireless Keyboard Works with unifying Receiver Very Good 5466 | eBay
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