The Polar V800 is an advanced multisports GPS watch for serious sports enthusiasts and professional athletes who want to reach peak performance. The V800 includes fast and accurate GPS functionality, allowing you to see your speed, distance, and route. Create and customise profiles for different sports and get exactly the data and guidance you need to train effectively in each one. Waterproof to 30 meters and can measure your heart rate even in water (requires additional sensor). Supports both pool and open-water swimming. Keep an eye on your running cadence to improve your running efficiency and avoid injuries and based on your long-term progress, Running Index analysis predicts your event finish times for 5K, 10K, half marathon and marathon runs. The V800 is compatible with Polar Bluetooth® Smart running and cycling sensors, which provide even more detail about your training.