inputs.text: great racing telehemetry racechrono - updatedowngraded product 2 stars lifespan average less 2 years bought 2 died 2 year mark battery life decreases rapidly use often sometimes battery quit first get replacement 30 device die completely no support qstarz recommend look garmin glo instead better accuracy hopefully last longeroriginal reviewgreat external bluetooth gps use racing telemetry applications like racechrono android use setup autocross rallycross hillclimbs track days great success 10hz mode check frog racing telemetry youtube videos use frog racing web site wwwfrogracingus telemetry section help set racing car