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The main difference is the display size. 41 mm has a 1.69-inch screen, while the 45mm model is slightly larger with a 1.9-inch screen. Both models offer the same health and activity tracking features.
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Yes, the GPS + Cellular models allow you to make calls, send messages, and more without needing to be near your iPhone.
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Yes, it's water-resistant up to 50 meters, so you can take it swimming or wear it during water-based workouts.
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The ECG app is included, allowing you to monitor your heart's health right from your wrist.
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The battery can last up to 18 hours with typical use and charges up to 80% in just 45 minutes.