Amazfit GTR 2e - smart watch, aluminum case, hi-res 1.39" AMOLED display, Always-On, Amazon Alexa, 90 sports modes, sleep quality monitor, SpO2 blood oxygenation sensor, 24-hour heart rate monitoring, stress level monitoring and total health score PAI, water resistance, music remote control, etc. Silicon strap, width 22mm. Additional Features : Up to 24 days of battery life under typical use Automatic recognition of outdoor running, treadmill, walking, outdoor cycling, pool swimming, and elliptical sport modes Use voice commands to control watch features, such as selecting sport modes and turning on functions Built-in speaker allows you to take hands-free calls via Bluetooth Dozens of customizable watch faces Upload your own picture to the watch face Modular design lets you customize watch face widgets to display information that's important to you 180° rotating screen for right- or left-handed wearers Movement reminder if you sit for long periods Daily activity tracking (steps, distance, and calories) Do Not Disturb, stopwatch, weather, temperature measurement, alarm, timer, and other functions