Accessport is a handheld device used primarily for tuning and monitoring vehicles. It connects to a car's onboard computer, allowing users to adjust performance settings, read diagnostic trouble codes, and track real-time data. This tool is popular among car enthusiasts who want to enhance their vehicle's performance. The device is compatible with various car models, especially those from Subaru, Ford, and Volkswagen. Users can customize parameters such as fuel maps and boost levels, making it easier to optimize their vehicle for specific driving conditions or personal preferences.