Wireless Dongle Receiver Unifying USB Adapter for logitech Mouse Keyboard Connect 6 Device for MX M905 M510 Keyboard K400 _ - AliExpress Mobile
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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
Amazon.com: Logitech K400 Plus Keyboard - Wireless Connectivity - RF - Black - USB Interface - Italian : Electronics
Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
Logitech K400 Wireless Keyboard (NO RECEIVER)(NO BATTERY COVER)
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech Wireless Touch Keyboard K400 Plus Review – Techgage
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Original Logitech Keyboard K400r K400plus Unifying Mirco Dongle Receiver USB | eBay