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 M510 Wireless Computer Mouse for PC with USB Unifying Receiver - Black - Walmart.com
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Logitech USB Unifying Receiver Dongle for Mouse & Keyboard 910-005235 (Two Pack) | eBay