Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
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Logitech Unifying Receiver for Connecting Multiple Devices
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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Best Buy: Logitech USB Unifying Receiver 910-005235
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech K400 Plus Touchpad Keyboard for TV connected PC
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
Logitech K400 Plus Wireless Touch Keyboard 920-007119 B&H Photo
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech Unifying receiver - Wikipedia
Genuine Logitech Unifying Mirco Dongle Receiver USB For keyboard K400r K400plus | eBay
Replacing Your Wireless Mouse / Keyboard Receiver - ComeauSoftware.com
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What can someone do if they've lost the wireless USB connector to their Logitech keyboard and mouse? - Quora