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Logitech Unifying receiver - Wikipedia
Unifying Receiver 1 to 6 Devices USB Wireless Keyboard Dongle Mouse | eBay
Logitech Unifying Receiver for Connecting Multiple Devices
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Logitech M720 Triathlon Multi-Device Wireless Mouse Bluetooth USB Unifying Receiver 1000 DPI 8 Buttons For Laptop PC Mac iPadOS - AliExpress
Zone Wireless Plus Unifying + Audio Receiver
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