Logitech K400 Plus Wireless Touch Keyboard Review | PCMag
Logitech Unifying receiver - Wikipedia
Logitech K400 Plus Review - RTINGS.com
Logitech K400 Plus Review - RTINGS.com
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6 Channel Wireless USB Adapter For Logitech Keyboard K400r K750 K800 K520 K710 | eBay
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Logitech K400 Plus Wireless Touch Keyboard
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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
Original Logitech Keyboard K400r K400plus Unifying Mirco Dongle Receiver USB | eBay