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Wireless Dongle Receiver Unifying USB Adapter for logitech Mouse Keyboard Connect 6 Device for MX M905 M510 Keyboard K400 - AliExpress
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
Logitech K400 Plus Review - RTINGS.com
Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
Genuine Logitech Unifying Mirco Dongle Receiver USB For keyboard K400r K400plus | eBay
Amazon.com: Logitech USB Unifying Receiver - 2 Pack For Personal Computer : Electronics
Wireless 2.4G Receiver Computer Keyboard and Mouse Transmitter USB 6 Channel Receiver Dongle Mouse Adapter for Logitech - Walmart.com
Logitech Unifying Receiver for Connecting Multiple Devices