Its purpose is to disguise spam bots by providing you with an encoded email that you can paste to your home page or a blog so that the email couldn't be picked up by these bots.
The code provided by obuscatr consists of a
<script> tag with hexadecimal representation of an email
mailto link. As Googlebot and other bots don't render client-side scripts the email in such form will also be excluded from the search results.
<a href="mailto:%6d%79%40%65%6d%61%69%6c%2e%63%6f%6d">Mail me<a>.
To use this option just tick off the checkbox on the back side of the widget.
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