The Amazfit GTR 4 uses industry-leading dual-band circularly-polarized GPS antenna technology so you can enjoy stronger positioning that's 99% as accurate as top handheld GPS locators. The Amazfit GTR 4 is the industry's first smartwatch with anti-glare technology on the glass bezel cover, and the large 1.43" AMOLED display has an anti-fingerprint coating to keep your watch looking pristine. Get down to business with a huge selection of over 150 sports modes, and support smart recognition of 8 Sports. The Amazfit GTR 4 smartwatch debuts the new BioTracker 4.0 PPG biometric sensor, you can enjoy more accurate 24-hour monitoring of heart rate, blood-oxygen saturation, and stress levels. Crush your professional and workout goals for up to two weeks at a time! The Ultimate Personal Assistant with Amazon Alexa Built-in and support Offline Voice Assistant.