This annual subscription gives you full access to over two hundred articles and videos about Solar Turbines and Pratt & Whitney FT8 turbines. Perfect for training and troubleshooting. I recommend you download the Excel Index File (click on the catalog button) to review exactly what articles and videos are available. The videos are located on the video hosting site "VIMEO" which allows a perfect streaming experience. Articles and videos or added weekly. There isn't any limitation on on usage, but note that material isn't downloadable. Much of the content is classified as Premium Content and requires a subscription.