This is difficult in dark settings because the adapter's connection is keyed so as to only fit in one way (does not rotate), but the label at the top is so faint as to be not visible except under bright and direct lighting

There is also a very bright blue LED light on the top which is lit when it is plugged in that becomes very annoying

The glaring power light may be an advantage as it could be viewed for miles and would remind you to turn it off maybe