Virtual devices reduce your costs of device presentation to wide range of people. You can send it to your clients by e-mail, put it to your web site, or you can burn it to CD/DVD. Virtual devices give your clients an understanding of how a product will look and have an idea of its functionalities. It can have also audio ( voice, music ) or video.
Example: Operate Virtual device (click here)
Please don't forget to turn device on, otherwise it won't work.