If running is what you do to stay in shape, the RS100 heart rate monitor from Polar will give you valuable feedback to improve your fitness and lose those last few pounds-easily integrate your heart rate into your fitness program. Includes wrist unit, Polar transmitter, and elastic strap. Wireless heart rate (displayed bpm as % maximum). Polar OwnZone automatically monitors your personal heart rate zones. Polar OwnCal tracks your calories and percent fat burned. Polar OwnCode prevents crosstalk with other monitors. Visual and audible target zone alarm. Average and maximum heart rate. 99 laps with average lap heart rate. Date/clock/time with backlight display. Alternating/repeating countdown timers. UpLink for data from Web to wrist unit. Zone limits and time in zones. Calorie expenditure (exercise/total/fat%. 1 exercise file with summary.