6+ days of battery and Water-resistant up to 50m. Compatible with iOS 15 or higher & Android OS 9.0 or higher. Built for better fitness results: Daily Readiness Score, built-in GPS and workout intensity map, Active Zone Minutes, all-day activity tracking and 24/7 heart rate, 40+ exercise modes and automatic exercise tracking. Tools to measure and improve sleep quality: personalized Sleep Profile, Daily Sleep Stages & Sleep Score, smart wake alarm and do not disturb mode. Maintaining a healthy body and mind: daily Stress Management Score, reflection logging, SpO2, health metrics dashboard, guided breathing sessions, menstrual health tracking and mindfulness content. Designed for fitness & beyond: on-wrist Bluetooth calls, texts, phone notifications, customizable clock faces and always-on display mode, Compatible with iOS 15 or higher & Android OS 9.0 or higher, thin, lightweight and water resistant to 50 meters, 6+ day battery & fast charge. Meet Google Health Coach. With Fitbit Versa 4, get three months of personalised coaching that adapts to you - all powered by effortless, accurate and continuous tracking.