Polar RCX5 SD Heart Rate Monitor Watch and heart rate monitor is versatile and durable enough for any sporting activity; designed for triathletes, serious runners, and endurance athletes Unique sports profiles guarantee swift switch between sports; ZoneOptimizer coaches you to train at the right intensity, improving performance with downloadable endurance training programs Unit provides heart rate information even in water with comfortable hybrid transmitter; Race pace function helps you cross finish line in time Comes with RCX5 training computer, WearLink+ Hybrid transmitter, s3+ stride sensor, DataLink data transfer unit, RCX5 Getting Started Guide, and s3+ stride sensor User Manual Includes limited two-year manufacturer's warranty