The Racelogic PerformanceBox is a performance meter which uses GPS data collection at the rate of 10 times per second to allow recording of speed, lap and split timing, G-force, 0-60, 0-100 braking distance as well as many other data references. The box also uses a live comparison to best lap to give a predictive lap timing function to give instant feedback on your driving to find improvements and maximise performance.Standard Contents: Kit 1: PerformanceBox 10Hz GPS data logger, windscreen suction mount and suction cups, in-car power supply - connects to 12V aux socket and software/manual CD Kit 2: In addition to Kit 1, also includes a mains power supply (includes adaptors to suit UK/EU/JP/US/AU, USB download cable and 2Gb SD card (everything included to get you up and running)! Kit 3: In addition to Kit 2 includes an external magnetic mount GPS antenna and professional plastic carry casePlease note: Some modern cars are fitted with a special windscreen that cuts down the amount of