Polar WIND transmission technology. Large customizable display showing four separate elements of information. Two timeline trend graphs can be displayed simultaneously providing at-a-glance feedback during exercise. Smooth and aerodynamic case design made from tough reinforced polycarbonates for maximum durability. Polar OwnIndex Fitness Test calculates aerobic fitness providing a reference to base training intensity and measure improvement. Target heart rate zones with 3 visual and audible alarms. Graphical comparison of heart rate and speed. Heart rate measurements. Automatic lap recording with exercise date. Exercise file info page with date and time. Semi-automatic backlighting. Water resistance to 10 meters (protects against rain and splashes). Polar OwnOptimizer. Cycling Efficiency Index. Incline Measurement. SpeedPointer. Estimated Time of Arrival. Polar OwnCal. Cycling Economy/Intensity. Material: Plastic Movement: Quartz Water-Resistant: 30m Color: Black Gender: Unisex Age: Adult Condition: New