The billion dollar question is what causes a person to buy? Is it the product you are selling or is it the salesperson selling the product? A compelling argument can be made for both schools of thought. Of course it can be a little bit of both depending on your buyer. The optimum solution is to know your audience. My personal approach in every sales call is to make the customer gain an emotional connection to me first and the product second.
Write something about yourself. No need to be fancy, just an overview.