Racelogic VBOX Sport Internal rechargeable battery with over 6 hours of battery life . A lightweight, waterproof, portable 20Hz GPS data logger that can be used in any vehicle and environment to measure performance or lap times . Includes data analysis software for Windows (Circuit Tools/PerformanceTools) . *Windshield/Handle Bar mount sold separately* Accurately measure 0-30,0-60,0-100 mph times using the VBOX Sport in junction with the free VBOX Performance Test iOS App.