The new Zepp OS is a slick operating system, which has a ton of customization options to make the watch easier to use. We just scanned the QR code on the watch with our iPhone and it automatically paired. First, you need to download the Zepp OS app to your Android or iOS phone, and pair or “bind” it to the watch. It’s really easy to set up the Amazfit GTR 3. ![]() ![]() The results will instead show in text or images on the watch display. The GTR 3 comes with a good quality inbuilt mic so you can use the offline voice assistant for basic control commands, or via Amazon Alexa – but it doesn’t have a speaker so don’t be surprised when Alexa doesn’t reply out loud. Quick-release pins let you easily swap out bands. The watch itself has a high-end look and feel with a matte finish around the bezel and a comfortable 22mm sweat-wicking silicone band, that you barely notice even when sleeping. The touchscreen is really responsive, while the back of the Amazfit GTR 3 is home to the advanced BioTracker 3.0 sensor and all the lights needed to measure key data including blood oxygen, heart rate and stress levels. The Hunt Fitness study published in the American Journal of Medicine (opens in new tab) found that keeping your PAI score at 100 or higher could reduce the risk of hypertension, heart disease and type 2 diabetes. It also has a Personal Activity Intelligence (PAI) score – a science-backed health score, which measures the heart health impact of physical activity. When you enable this, it will automatically switch on GPS tracking, which is a bonus. ![]() It comes with 150+ sports modes, eight of which are auto-detection. In that sense, it's a good fitness tracker too. It’s got all the health and fitness metrics you’d expect, from all-day heart rate monitoring, menstrual cycle tracking, ovulation prediction, sleep and stress tracking, blood oxygen levels and breathing rate. The Amazfit GTR 3 offers 4-in-1 health measuring powered by BioTracker 3.0, which is impressively accurate. ![]() Memory: All info is saved to the Zepp appĭisplay and size: Amoled HD / 1.39 (round) Software: RTOS (real-time operating system) via Zepp app
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