Just think on the needs level and find out what needs a buyer wants to fulfil and what they would want to eliminate. Needs are not features. Needs are things like saving time, spending time with the family, knowing something, or achieving success. That is what you will be selling all along. You only mention the features as a side item to seal the decision logically, but the decision to buy will be based on emotions and needs.
Most people ignore advertising or direct calls to buy something.
They get defensive initially. They even learn to automatically 'not see' advertising. I am sure that your brain somehow blocks out all those banner ads and only very rarely do you even really notice what is really on those banners. What if it did not look like an ad. What this means is that your Web site, your banners, and everything else should have nothing that smells of advertising.