This forum discourages threads which have only a hyperlink as post#1, the usual term for these threads is a "drive-by".
Furthermore, the product that is linked to has doubtful utility and as a responsible firearms owner I have serious doubts as to this particuar implementation.
The numerous comments at the bottom of that webpage illustrate this very clearly.
If the OP has insightful commentary or information to report on the "flashlight" in question they have the option of opening a new thread.
Best regards,