Best Buy: Logitech USB Unifying Receiver 910-005235
For Logitech K800,K750,K710,K700,K520,K400,360 Unifying USB Dongle/Receiver – ASA College: Florida
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Logitech MK520 Wireless Keyboard Mouse Combo with Unifying
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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