Operating system Android Memory storage capacity 4 GB Special features Activity Tracker Battery capacity 400 Connectivity technology Bluetooth About this item Great display: 1.82 inch AMOLED display, 1500 nits max. Brightness, 347 PPI vivid view, ultra-flat edges and a heavenly high aspect ratio of 77.4%, with a refresh rate of 60 Hz and automatically adjustable brightness. Ultra-slim design: the HUAWEI Watch Fit 3 is an ultra-flat smartwatch with only 9.9 mm thickness and 26 g weight. The aluminium alloy case and smooth metal clasp are absolutely cool and eye-catching. Comprehensive fitness management: a completely new function with intelligent suggestions recommends sports and activities you can try based on your training habits, calorie consumption and even weather conditions. Watch Fit 3 supports more than 100 invigorating training modes and automatically detects six types of exercises. 【Comprehensive Health Management】Comprehensive sleep monitoring: keep track of your heart rate, SpO2, breathing rate and abnormal breathing forms while you sleep, so you can keep an eye on everything at all times. Advanced vital signs tracker: Keep track of running or exercising with enhanced heart rate monitoring with our multi-channel module and smart fusion algorithm. Long battery life: with a battery life of up to 7 days or a maximum of even up to 10 days, you can start the day with peace of mind. Compatible with iOS and Android: The HUAWEI Watch Fit 3 is compatible with both iOS and Android.