Hapeman's TDC Tester is lightweight and portable, making it easier than ever to transport and connect. Simply hook it up, start the test, and get the results fast, less than 5 minutes! To add to its portability, the TDC Tester doesn't require a power source as long as the computer is charged. Its graphic display is bright, clear, and uncomplicated, perfect for any user! The TDC Tester runs 50, individual comprehensive tests, then averages them into 1 overall result.