FASHION and TECHNOLOGY MEETS. GT 4 Watch has been created with an elegant aesthetic design and powerful battery life and +100 accurate sports modes so you can keep everything on track on your daily life SCIENCE-BASED CALORIE MANAGEMENT. The new Stay Fit app helps you keep track of how many calories you are consuming with real-time calorie intake, active calories, resting calories, and calorie deficit STRONG HEALTH MONITORING. Keep in track your health with HUAWEI TruSeen 5.5+ Heart Rate Monitoring, SpO2, TruSleep 3.0, Sleep Breathing, stress monitoring and the new Pulse Wave Arrhythmia Analysis COMPATIBLE WITH iOS ANDROID DEVICES. HUAWEI WATCH GT 4 has been created to be convenient and be used with ease, that is why is compatible with iOS devices and Android devices. FEMALE HEALTH MANAGEMENT 3.0. Get estimated period, ovulation, and fertile times at just a glance, which are based on high-level physiological data and a deep learning algorithm