PowerTap Pro is the premier training measurement system. While you ride, the chest strap and hub transmit detailed information several times a second. Based on that data, the handlebar-mounted display instantly shows power, heart rate, cadence, speed, energy expenditure, distance, ride time and time of day. The PowerTap can record your every heart beat and pedal thrust for up to 7 hours at 1-second recording rates. When you finish your ride, download all that data through a USB cable to your PC or Mac for detailed analysis with CycleOps' PowerTuned software (included). And, the PowerTap Pro can store an unlimited number of intervals.