Get inspired and stay accountable with Versa 4 + Premium - learn when to work out or recover see real-time stats during exercise and find new ways to keep your routine fresh and fun. Operating temperature: -14° to 113°F. Radio transceiver: Bluetooth 5.0.Maximum operating altitude : 28 000 feet (8 534 m). Daily Readiness Score(1) 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 water resistant to 50 meters. Personalized Sleep Profile daily sleep stages & Sleep Score smart wake alarm and do not disturb mode. Compatibility-Apple iOS 15 or higher Android OS 9 or higher 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 and phone notifications customizable clock faces Fitbit Pay Amazon Alexa built-in Google Wallet & Maps 6+ day battery.