At the heart of your training lies the RS800CX wrist unit. With the ability to record a wide range of performance details, the unit works with the WearLink®+ transmitter W.I.N.D. to provide you with the most accurate measurement of your heart rate. This kit at the most basic level is compatible with all W.I.N.D. sensors, so you can create and build on your training system to keep up with all your training challenges - now and in the future.

• Synchronizes with the Polar ProTrainer 5^TM software for guidance, analysis and creating individual training settings
• Highly sensitive barometric altitude sensor shows your elevation profiles
• Determines if your training program and recovery time are optimally developing your performance
• Sets personal training zones so that you can train at the right intensity