Polar S725X Heart Rate Monitor Powerful cycling computer with heart rate monitor; measures speed, distance, and training conditions like altitude and temperature Wirelessly sends exercise data to PC via infrared connection; can also wirelessly transmit to Nokia 5140i or 5140 cell phones Displays your heart rate as beats per minute and percentage of maximum heart rate, average heart rate, and exercise duration Ability to enter two different wheel sizes, enabling you to train on two different bikes Large easy-to-read display with backlighting and split screen