Wear OS 4, Snapdragon W5 + BES2700 dual chipsets with 2GB RAM and 32GB ROM memory, Up to 100 hours battery life in Smart Mode (Up to 48 hrs with heavy use), and 12 days battery life in Power Saver Mode. Fully charged in 60 mins with VOOC fast charging and 24 hrs of use with 10 mins of charging. Stainless Steel chassis and Sapphire Crystal cover, Military grade MIL-STD-810H standard certified. 5 ATM + IP68 rated. Track all your favorite workouts, with extensive specialized metrics for Running & others. 20 built-in watch faces + 80 downloadable watch faces that can also work in Power Saver Mode.