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Logitech Unifying receiver - Wikipedia
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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
Amazon.com: Logitech K380 Multi-Device Bluetooth Keyboard (Dark Gray) Bundle with Knox Gear USB Bluetooth 4.0 Dongle Adapter (2 Items) : Electronics