I bought this because I needed what was shown in the product photo for a project that needed to be completed this weekend. Two things wrong with the product photo. It shows a positive lead on the male side of the SAE. What I got was negative on the male side of the SAE. That wouldn't be a big problem if it weren't for the second problem with photography. There is NO adapter for polarity reversal! It's funny how such a small item can ruin a weekend.