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Lenovo Mini Wireless Keyboard: Readable Power Switch
The backside of the Lenovo N5901 Mini Wireless Keyboard (which arrived with the aforementioned Q150) has a black-on-black power switch with ON and OFF legends (yes, I think they’re backwards, too) embossed in the matte black case: under anything less intense than enhanced interrogation lighting, you (well, I) can’t determine the switch position.
Of course, the myriad certifications / ratings / labels required for compliance with all the regulations are perfectly legible:

Lenovo Mini Keyboard – enhanced labels Working a dab of white correction fluid into the letters makes them blindingly obvious; the smudges around the letters will wear off in short order.
I should probably add a bit of white to the switch background as well.