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Wireless Dongle Receiver Unifying USB Adapter For Logitech Mouse Keyboard Connect 6 Device For MX M905
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Genuine Logitech Unifying Mirco Dongle Receiver USB For keyboard K400r K400plus | eBay
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Wireless USB Receiver Dongle 6 Channels Adapter For Logitech Unifying Keyboard K400/Mouse MX M905 M510 Repair Replacement - AliExpress
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Logitech Unifying receiver - Wikipedia
Short review: Logitech K400r vs Plexgear Mediatrack Ergo - Erik Moberg's personal homepage - photography, gadgets, DIY, and more