Battery Life: Up to 7 days of battery and Water-restitant up to 50m Compatibility: Compatible with iOS 13 or higher & Android OS 8.0 or higher Included inbox: Fitbit Charge 5 Tracker (Size Small and Large Straps included); Straps not compatible with other models; Wrist straps measure small 140 mm–180 mm with additional Large 180 mm–220 mm; Charger also included (compatible with Fitbit Luxe, not compatible with other models) 6-month Premium Membership included: Discover the full Fitbit experience with personalised insights. Connect the dots across your activity, heart rate, stress and sleep so you can make smarter choices. Plus, new Premium features with Charge 5, Daily Readiness & Health Metrics Dashboard. Sweat the smart way: Daily Readiness, Reminders to move, 24/7 heart rate, Automatic activity tracking, 20 exercise modes, workout intensity map, Built-in GPS