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Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
For Logitech K800,K750,K710,K700,K520,K400,360 Unifying NANO USB Dongle/ Receiver – ASA College: Florida
Genuine Logitech Unifying Mirco Dongle Receiver USB For keyboard K400r K400plus | eBay
Quest 2: Logitech k400 plus tracked as k830 using an usb adaptor for the dongle : r/OculusQuest2
Amazon.com: Logitech USB 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
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Logitech K400 Usb Unifying Receiver - Wireless Dongle Receiver Usb Adapter 6 M905 - Aliexpress
Logitech Unifying receiver - Wikipedia
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Logitech K400 Plus Touchpad Keyboard for TV connected PC
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Logitech K400 Plus Wireless Keyboard and Touchpad w/ USB Dongle Receiver | eBay
Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
keyboard - How To Replace Logitech Wireless Unified USB Plug In Ubuntu - Ask Ubuntu