The Polar FT4 Fitness Monitor is designed for those who want basic heart rate-based features to help with fitness training. Put on the WearLink+ transmitter chest strap for your heart rate and get started! Receive stats like average and maximum heart rate during your workout. When your heart rate exceeds the upper limit or goes below the lower limit of your target rate, the Polar FT4 will notify you with visual and audible alarm alerts. The fitness monitor also counts and displays calories burned during each session.