Logitech MK540 Advanced - keyboard and mouse set - 920-008671 - -
Logitech K540 Y-R0012 Wireless Desktop Keyboard Only - No Dongle Unifying Device 97855152732 | eBay
Logitech Mk540 Wireless Keyboard Mouse Combos With Unifying Usb Receiver Mice Keys Set For Pc Laptop Office Business Game - Keyboard Mouse Combos - AliExpress
Logitech MK540 Advanced wireless keyboard and mouse review: Snappy typing, no noise | PCWorld
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Logitech K540 Wireless Keyboard + Mouse, Tested and Working | eBay