Long-Lasting Battery & Compatibility: Go longer on a single charge with a convenient USB magnetic charger. Enjoy 7-10 days of battery life—no need to charge it frequently during business trips or travel. The smartwatches are compatible with Android 5 / iOS 9.0 or above smartphones. (Not for PC or tablet). Practical Functions: FITVII smartwatch is a life assistant. Many valuable functions include alarm clocks, water drinking reminder, sedentary reminder, stopwatches, timers, music control, find your phone, customized watch face, etc. Smart Notification: Get vibration alerts for all notifications, including phone calls, texts, and social media app alerts. Never miss a message with smart notifications delivered right to your wrist. You also can check real-time weather on the smartwatch. Activity Tracking: Find interest to keep moving with more than 20 sports modes, including walking, running, cycling, climbing, swimming, yoga and many more. FITVII activity tracker is ip68 waterproof. Workouts On-Screen: Check daily workout clearly on a 1.7'' HD bright color display. Create customized fitness schedules and goals based on daily workout data such as steps, distance, and calories provided by the FITVII fitness tracker so you can make the most of your workouts. Advanced Sleep Monitor: Track your awake, light, and deep sleep time and gauge blood oxygen saturation levels during the night. 24/7 Fitness Monitoring: Know your body better by using FITVII smart watch all day fitness monitoring. Get heart rate, blood pressure and blood oxygen on your wrist. (Only for encouraging a healthy lifestyle, not for medical use).