In sales, your presentation should be designed to share with the audience what you understand about their needs and how you can assist them.
This means that you need to build a presentation that allows you to expand on areas that are of interest to your client.
By doing this you will be able to turn a sixty-minute general presentation with a client into a tailored discussion about their needs.
No matter what product or service you sell, there are usually only one to two key factors that cause a client to buy. Remember, the client is never buying your product, they are buying the product of your product.