Genuine Logitech Unifying Receiver-Wireless Mouse/Keyboard USB Dongle-6 Devices | eBay
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Marcus Mengs on Twitter: "Logitech Unifying receiver fake. Bought 3 cheap Unifying CU0008 receivers (TI chip). Turner out, they all are CU0007 (Nordic) with wrong label and ALL HAVE THE SAME S/N
Amazon.com: Logitech USB Unifying Receiver - 2 Pack : Electronics