Key Features
Large Display: The 45mm model features a larger, Always-On Retina display compared to older models, providing more screen space for apps and notifications. 
Health Sensors: Includes an electrical heart sensor for ECG and a blood oxygen sensor for blood oxygen measurements. 
Durability: It's swim-proof with 50-meter water resistance and features a ceramic and sapphire crystal back. 
Built-in GPS: Accurately tracks your location for workouts and other activities, even without your phone nearby. 
Fast Charging: Offers fast charging for quicker power-ups.