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User manual Logitech K400 (English - 2 pages)
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How To Fix Logitech K400r Keyboard (Keys not responding) - YouTube
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Logitech K400 Plus Keyboard Not Working Troubleshooting Guide - YouTube
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I'm sick of old stuff you can't but anymore on this sub! I bought this Logitech k400r about 10 years ago and no matter how much I abuse and/or neglect it, it
Logitech Wireless Touch Keyboard K400 Plus review: Logitech's $40 K400 Plus spruces up the couch-potato experience - CNET
