Any thing you can do to show all the screens for both the PC and mobile device would help promote the product. If IOS and android are different then this would be good to. I think that the most useful tool for you would be 3 separate PDF files, one for each interface, along with any other relevant info (setup, links, versions, etc).
This would also be good for the downloadable app, if it still is available.
As for frietpans suggestion and your concern, what about a script that resets the device to default every few hours.