I saw a video ad on YouTube for this device [please note, my post is not an affiliate link and I have no relationship with the company and no experience with the product].
I simply included the Landing Page from the video link because it is a good example of what I suspect is an effective sales landing page.
So here is the link to the landing page.
And here is a copy of the beginning of the landing page:
Go to the link for the page to review the entire excellent sales landing page.