For endurance athletes who want precise coaching to perfect their training. Zone Optimizer coaches you to train at the right intensity Sport profiles guarantee swift switch between different sports Improves performance with endurance training programs, downloadable from polarpersonaltrainer.com with the Polar Data Link Gives heart rate even in water with a comfortable hybrid transmitter Race Pace helps you cross the finish line in time Light (46g) & always readyfor use with no need for charging Up to 8-11 months of battery life The Polar RCX5 heart rate monitor is created for endurance multisport athletes who need one-watch solution. The watch features sport profiles for easy switching among disciplines & monitoring the performance. Waterproof up to 30m, it can be successfully used underwater without risk of damage. The Wearlink+ Hybrid transmitter gives accurate heart rate measurements both in & out of water thanks to communicating with the wrist unit in two frequencies. The heart rate monitor helps the user train at the right intensity & avoid over- or undertraining. The data can be transferred to the computer by the Data Link transmitter (included). There is also an option of storing & analysing the data online & downloading new endurance training programmes.