It appears the dongle for your keyboard is no longer available. They are specific to the unique keyboard and mouse, so you really need to replace the keyboard and mouse. You can follow the link below to the Lenovo.com Accessories site for the current slim line wireless keyboard. Please note, any wireless keyboard and mouse, compatible with Windows 10 will work with your system. Just use the dongle that comes with the new keyboard and mouse.
http://search.lenovo.com/search?w=lenovo%20ultraslim%20plus%20wireless%20keyboard%20and%20mouse
8 years, 6 months ago
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Lenovo Product Expert