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Logitech Unifying Receiver mini nano CU0003 USB dongle for wireless mouse

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Logitech Nano Receiver non-Unifying C-U0019 USB dongle for wireless mouse CU0019

Logitech Unifying Receiver mini nano C-U0012 wireless mouse keyboard USB dongle

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Genuine Logitech Unifying Receiver-Wireless Mouse/Keyboard USB Dongle 6 Devices