After unpacking I have dealt with the same problem here already angesprochenem the reverse polarity. I can say quite clearly yes you can because waste very quickly. Especially when one no longer has the best eyes. The markings should be my feeling in color from black stand out example. simply white. The marking on the plug cable is a small lettering, which you can read just need to make one then the adapter plug, depending on the desired polarity, just with Minus / - or plus / + identification can also be read in parallel with the insert lettering. If one has but accustomed by slightly palpation or using brighter lamp or magnifying glass works of universal power plug easily without being great hot or to prove a second box. The screening of the switch is not too light and not too heavy by the operator forth. Because of the rather small illegible marks a star deduction
