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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Logitech M185 Wireless Mouse - Optical - Wireless - Radio Frequency - 2.40 GHz - Gray - 1 Pack - USB - 1000 dpi - Scroll Wheel - 3 Button(s) - Symmetrical - ICC Business Products
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Amazon.com: Logitech Unifying Receiver USB Dongle for Logitech M185 Wireless Mouse and Keyboard : Electronics