Optimize your training by getting data from all three sports! Maintain proper heart-rate during your training sessions with the ZoneOptimizer. The WearLink+ Hybrid transmitter delivers your heart-rate at all times, even while training in the water. Stop guessing at how far you've traveled with the G5 GPS sensor. Redesigned for the new season, the G5 GPS sensor weighs in at 34 g and is now smaller than ever! Comes with a 20 hour life rechargeable battery. Using W.I.N.D. technology, the Polar RCX5 delivers you cycling speed, candence and distance all without wires! S3+ stride sensor measures average stride length, speed/pace and distance with the lightweight sensor. Create multiple Sport Profiles; keep all your data separate. Visit polarpersonaltrainer.com to create multiple training programs and get the most out of your Polar RCX5!