Features:Activity Tracker: Records accurate real-time heart rate and monitor daily distance, speed, time, steps, calories burned, swimming data.Notification Reminder: Sync and vibration alerts the notifications from incoming calls, messages or wechat. Never miss any important business.Compatibility: Compatible with BT4.0 smartphones, suitable for iOS 8.0 or above, for Android 4.3 or above.Long battery life: 80mAh lithium battery works for up to 96 hours, standby time up to 240 hours, only 30 minutes to full charge!Great Craftsmanship: Built-in 0.91 inch OLED touch screen clearly shows time, date, day of a week. Ultrathin and lightweight (25g), adjustable wristband for comfortable fit.IP68 Water Resistant: You can wear it when taking shower and swimming.