Polar CS600X Cycling Heart Rate Monitor with Power Sensor W.I.N.D. Handlebar-mounted cycling computer for advanced riders, compatible with optional G3 GPS sensor Includes with W.I.N.D. Power Sensor, combining heart rate monitoring and power output measurement Determines if your training program and recovery time are optimally developing your performance Included Polar ProTrainer 5 software enables you to plan, analyze and follow up your training Views route information in mapping software, such as Google Earth (with optional GPS accessory)