Get inspired and stay accountable with Versa 4 and Google Health – 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 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, water resistant to 50 meters Tools to measure and improve sleep quality: Daily sleep stages and Sleep Score, smart wake alarm, and do not disturb mode Maintain a healthy body and mind: Daily Stress Management Score, reflection logging, SpO2, health metrics dashboard[1], guided breathing sessions, menstrual health tracking and mindfulness content Designed for fitness and beyond: On-wrist Bluetooth calls, texts and phone notifications[2], customizable clock faces, Amazon Alexa built-in[3], Google Wallet & Maps, 6+ days of battery life[4] Small and large bands included; small size fits wrists 5.1-7 inches in circumference; large size fits wrist 6.5-8.6 inches in circumference Includes a 3-month Google Health Premium membership complete with personalized coaching, advanced analytics, guided programs, and more[5]