Logitech Standalone USB Unifying Receiver (910-005235)
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Logitech Unifying receiver - Wikipedia
Logitech USB Unifying Receiver Dongle for Mouse & Keyboard 910-005235 (5 Pack) - Walmart.com
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Logitech New Logitech Unifying USB Receiver for Keyboard K230 K250 K270 K320 K340 K350 K750 K800 Keyboards - Walmart.com
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Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech USB Unifying Receiver - 2 Pack For Personal Computer : Electronics
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