The color(s) white, black, chartreuse, kelly green is/are claimed as a feature of the mark.
The mark consists of a black outlined box with rounded corners and a large, chartreuse, kelly green check mark with the tail of the check mark exiting the top, right corner of the box. The words , "Opt-IN Optimizer" appear to the right of the box in Arial font. "Opt-IN" is located on the top line in bold with "Opt" in black lettering and the capital letters, "IN" in the same chartreuse, kelly green color as the check mark. Below "Opt-IN" appears the word, "Optimizer" which does not contain bold lettering and is in black lettering. The background is white.