New in box Model number 145930 The polar pacer controls intensity by keeping you in the crucial personal heart rate target Sommer exercises, productive, and safe. Large easy to read wrist monitor display the permits, continuous heart rate monitoring during any kind of exercise Wireless sensor/transmitter, worn on a comfortable chessman to measure heart rate with ECG accuracy, with no encumbrance to activity The ability to program and personal heart rate limits to see inside the users target sound