Package Contents (1) Fitbit Inspire HR Tracker (1) Wristband (Small/Large) (1) Charging Cable The Unit Must Be Fully Charged & Updated via Fitbit App Prior to Use. WRIST SIZES: Small 5.5"–7.1" 140 mm–180 mm Large 7.1"–8.7" 180 mm–220 mm Fitbit Inspire HR™ is a friendly heart rate & fitness tracker for every day that helps you build healthy habits. This encouraging companion motivates you to reach your weight and fitness goals and even enjoy the journey with 24/7 heart rate, workout features, calorie burn tracking, goal celebrations, sleep stages and up to 5 days of battery life. 24/7 HEART RATE: helps you maximize your exercise sessions, see heart rate zones, see sleep stages and better track calorie burn. SLEEP STAGES: Inspire HR and your app show you how much light, deep and REM sleep you get. ALL-DAY ACTIVITY: Every part of your day impacts your goals, so Fitbit Inspire HR™ tracks all-day steps, distance, active minutes and calories burned. SWIMPROOF + SWIM TRACKING: Swimproof, so you can wear Inspire HR in the shower, pool and beyond.* GUIDED BREATHING SESSIONS: Fitbit Inspire HR™ helps you find moments of calm throughout your day with personalized guided breathing sessions. INTUITIVE TOUCHSCREEN DISPLAY: The Inspire HR touchscreen has a backlit OLED display and responds to natural swiping and scrolling. FEMALE HEALTH TRACKING: Understand your body on a deeper level by using your tracker with the Fitbit app to follow your cycle, record symptoms.