If you are not able to describe your product in less than 120 characters then you need to go back to your drawing table.
For example, Steve Jobs described his MacBook Air as world’s thinnest notebook, this little sentence speaks volume. Before going into details listeners must get a sound idea from your subject. You must create description for your product in single sentence. However, Steve Jobs have never used PowerPoint, but his techniques can be used in every type presentation.
Neurologists have discovered that brain gets bored soon so don’t give time to your audience that they could distract their mind from presentation. Before telling story plot a graph and make it interesting and engaging by using visual aids, whiteboards, sketching graphs and raise brainstorming queries from audience.