AMAZON ALEXA BUILT-IN & BLUETOOTH PHONE CALLS: Talk to Amazon Alexa on your Amazfit GTS 2. Ask questions, get translations, check the weather, control your smart home devices, and more. Also, you can answer calls on your smart watch via the built-in microphone and speaker upon the connection to your phone via Bluetooth. LONG 7-DAY BATTERY LIFE & GPS BUILT-IN: The GTS 2 smart watch is equipped with a powerful 246mah battery that can last 7 days with typical use, and is always ready to escort you on your journeys and track your progress. And get precise tracking of your daily steps, distance traveled, and calories burned thanks to integrated GPS. 90 SPORTS MODES & 5 ATM WATER RESISTANT: Amazfit GTS 2 features 90 built-in sports modes and is waterproof to a depth of up to 50 meters. Intelligent recognition of 6 sports modes also eliminates the need to manually select the sports modes, so the fitness sports watch is always ready for action. 3D CURVED DESIGN & HD AMOLED SCREEN: The curved 1.65-inch HD AMOLED screen of the Amazfit GTS 2 smartwatch, covered in 3D glass, boasts a crystal-clear 341ppi pixel density, and the bezel-less design naturally transitions to the aluminum alloy watch body for an enhanced visual aesthetic and a wider content display area. ALL-ROUND HEALTH TRACKING: Equipped with a Huami-developed second-generation ppg bio-tracking optical sensor, the GTS 2 can provide 24-hour heart rate monitoring. This smartwatch is also capable of blood-oxygen saturation measurement, sleep and stress level monitoring. Built-in the PAI health assessment system, which uses algorithms to convert all of your complex health and activity data into one single score, helping you understand your physical state at a glance.