Wear OS by Google works with phones running the latest version of Android (excluding Go edition and phones without Google Play Store) or iOS. Supported features may vary between platforms and countries with compatibility subject to change. | 24 Hr + multi day Extended Mode **Varies based on usage and after updates install**. USB data cable with magnetic dock snaps to split rings on watch caseback and spins 360 degrees for ease of use. Approximately half an hour to reach 80%. | Always on Display now brighter with more colors. Thousands of watch faces to personalize your look and always see the time. Hundreds of apps from assistant to fitness, payments, music, social, news, games, stop watches, and more. With a 3 ATM design and charging in about half an hour, it’s perfect for all your activities. | Automatically tracks activity goals, steps, sleep, heart rate, cardio level, SPO2 (blood oxygen), and more. Activity modes with GPS keep you on track with your distance and path. Advanced sensors provide the data to power all your health and fitness apps. | Get a little extra help with Alexa built-in. Easily access the Amazon Alexa app to get quick news and information, check the weather, set timers and alarms, control smart home devices, and more - all through the sound of your voice.