For Logitech K800,K750,K710,K700,K520,K400,360 Unifying USB Dongle/Receiver 713929760527 | eBay
Logitech Unifying Receiver for Connecting Multiple Devices
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Logitech K400 Plus TKL Wireless Membrane Keyboard for PC/TV/Laptop/Tablet with Built-in Touchpad Black 920-007119 - Best Buy
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Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
Genuine Tiny Unifying Usb Receiver Dongle For Logitech Mouse And Keyboard Can Connect Up To Six (6) Devices W/ Unifying Logo - Keyboards - AliExpress
Genuine Logitech Unifying Mirco Dongle Receiver USB For keyboard K400r K400plus | eBay
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