The web page gives me pretty much absolutely no idea what this product does, except for the abstract "notify me of things". How does it do it, how do you interface to it, etc?
Notifon is universal. You can use any sensor that has two states, such as a switch, a push button, a magnetic door switch, a relay... Notifon allows you to predefine a set of actions for each state."
Just put that (or a simplified form of it - a graphical illustration is helpful) somewhere quite visible on the actual product page?