Operating system HarmonyOS Memory storage capacity 64 GB Special features Activity Tracker, Always On Display, Fall Detection, Multisport Tracker, Touchscreen Battery capacity 867 Connectivity technology Bluetooth About this item Up to 21-Day Battery Life: Signature strong endurance with up to 21 days battery life. With the innovative adoption of a high-silicon battery, the energy density surges by 37%. Go all out on your adventure on one charge. Broadly Compatible: HUAWEI WATCH GT 6 Pro is compatible with both iOS and Android for greater ease of use. Wrist circumference: 140–210 mm ECG Analysis: Hold down on the electrode on the side for 30 seconds to generate an ECG report on your watch after the measurement. Pro-level Cycling Tracking with Virtual Cycling Power: The watch always keeps you company in the case of emergency. Just relax and ride along. Cycle for up to 40 hours. It's always here as you aim for somewhere far. Get new cycling power metrics on your wrist. Train with science. Iconic Stylish Design: The 1.47-inch AMOLED display boasts a 5.5% larger screen area for greater immersion.4 The brightness ramps up by 1.5 times at up to 3000 nits, ensuring easy legibility even under sunlight outdoors.