The Flashpaq F5 works by connecting to your car or truck's PCM or ECU through it's OBD-II port with its included cable. The Flashpaq then detects your vehicle and gives you several different tune options based on both fuel octane and application. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.