For triathletes and endurance athletes looking for better performance. Allows you to create your own sport profiles Supports multisport training through swift switching between sports ZoneOptimizer personalizes your sport zones during your warm-up Improves performance with endurance training programs, downloadable from polarpersonaltrainer.com with the Polar DataLink Gives heart rate even in water with a comfortable hybrid transmitter * Compatible with Polar running, cycling and GPS sensors Up to 8-11 months of battery life