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Logitech USB Unifying Receiver | 2.4 GHz, 6 Wireless Devices
Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007) : Electronics
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Logitech Unifying receiver - Wikipedia
Logitech Unifying Vs Non-Unifying Receiver (software in description) - YouTube