Polar M400 is a water-resistant GPS running watch, 24/7 daily fitness tracker. It helps to plan optimal running training, offering speed/pace zones, distance, cadence and running index, and includes a fitness test function. GPS and Back to start feature allows for exploring new running paths without getting lost. View your training benefit and training load in the Polar Flow app and web service. The polar m400 is a gps running watch and 24/7 daily fitness tracker ; includes a polar h7 heart sensor. Features integrated gps and a back to start; function that allows you to explore new running paths and running cadence from the wrist and steps and distance and end time estimator. Measures your daily activity, workouts and sleep and receives smart notifications and inactivity alerts. Monitors your training load and helps you to recognise your personal limits. Fitness test function; a five-minute test that measures aerobic fitness from resting heart rate. Wrist monitor. (not included). Manufacturers 2 year guarantee.