The Fitbit Charge 2 large fitness tracker with heart rate sensor is a sleek, versatile & highly functional device designed to let you track progress every day & increase your health & fitness levels, as well as to improve sleep quality. It provides precise Pure Pulse® wrist-based heart rate reading with simplified heart rate zones & helps you understand sleep patterns with auto sleep tracking & sleep stages features. Use multi sports modes to see real time exercise stats on display & connected GPS to record a map of each route & view distance & pace as you run. Personalize your tracker thanks to an interchangeable band & get friendly Reminders to Move to reach an hourly goal of 250 steps. The Charge 2 has a long battery life (up to 5 days) to allow for all-day activity tracking & offers an interactive, user-friendly tap OLED display.