Plan and track your training with the Polar Flow app, no subscription required. Nylon wristband is comfortable enough to wear day and night. Perfect for men or women. Tailored daily workout routines and Smart Calories functions to guide you to better fitness. Receives phone notifications to stay connected when you need to be. Water resistant with GPS that tracks every step and turn. Features advanced, wrist-based heart rate monitoring and specialized sleep and recovery tools for improved performance. Easy, single button use. Up to 50 hours of battery life on a single charge in training mode (up to 4 days in watch mode). Lightweight fitness tracking smartwatch to help keep you active.