User manual Logitech K400 (English - 2 pages)
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YR0055 2.4GHz Cordless Keyboard User Manual K400 plus Logitech Far East
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USB Dongle/Receiver For Logitech K800,K750,K710,K700,K520,K400,360 Unifying | eBay
How to Connect Wireless Keyboard With & Without Receiver?
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
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