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Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
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Logitech K400r Wireless Keyboard With Touchpad & USB Receiver Black Tested | eBay
Logitech K400r Wireless Keyboard With Touchpad & USB Receiver Black Tested | eBay
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Logitech K400 Usb Unifying Receiver - Wireless Dongle Receiver Usb Adapter 6 M905 - Aliexpress
Logitech K400 Usb Unifying Receiver - Wireless Dongle Receiver Usb Adapter 6 M905 - Aliexpress
Original Logitech Keyboard K400r K400plus Unifying Mirco Dongle Receiver USB | eBay
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