Apple Watch Series 11 with Apple Logo

Key Features and Highlights

Health Features

Hypertension Notifications: Series 11 can alert you to potential high blood pressure. It uses data from the optical heart-rate sensor over time to analyze patterns. 
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Sleep Score: Introduced in watchOS 26, this feature gives a score for the quality of your sleep based on factors like duration, consistency, wake-ups, and time in different sleep stages. 
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It still supports other health tracking: ECG, blood-oxygen monitoring, irregular rhythm alerts, and more. 
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Battery & Charging

Up to 24 hours of normal use on a full charge. 
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Fast-charging: 15 minutes of charging gives about 8 hours of battery life. 
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In Low Power Mode, it can last up to 38 hours. 
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Connectivity

5G Cellular: For models with cellular, Series 11 supports 5G, so you can stream music, take calls, and use apps even when your iPhone isn’t nearby. 
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Uses eSIM for the cellular models. 
AT&T

Durability & Build

More Scratch-Resistant Glass: Aluminum models use Ion-X glass that’s 2× more scratch-resistant than Series 10. Apple says there is a ceramic coating applied on the glass. 
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Water & Dust Resistance: Rated WR 50m (so suitable for swimming) and has an IP6X dust-resistance rating. 
PhoneArena

Case Options:

Aluminum: Rose Gold, Silver, Space Gray, Jet Black 
Apple Support

Titanium: Natural, Gold, Slate 
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Environmental Build: 40% of the watch’s materials are recycled. Apple uses 100% recycled cobalt in the battery and recycled aluminum or titanium in the case. 
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Design & Size

Two sizes: 42 mm and 46 mm 
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Case thickness is 9.7 mm. 
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Weight (Aluminum): ~30.3g (42 mm) and ~37.8g (46 mm) for GPS. 
Apple Support

Display: Always-on Retina LTPO OLED. 
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Chip & Storage

Uses the S10 chip, not a new S11. 
MacRumors

64 GB of internal storage. 
Apple Support

Sensors

Electrical heart sensor

Optical heart rate sensor (3rd gen) 
Apple Support

Blood oxygen sensor

Temperature sensor 
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Compass, always-on altimeter, high-g accelerometer, gyroscope, ambient light sensor

Depth gauge (up to 6 m) and water temperature sensor on appropriate models 
Apple Support

Controls & Gestures

Digital Crown (haptic feedback) and a side button 
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New wrist-flick gesture: flick your wrist to dismiss calls, timers, or alerts. 
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Double-tap also supported. 
Apple Support

On-device Siri support. 
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Software

Ships with watchOS 26. 
AT&T

New features in watchOS 26: Liquid Glass UI design, new watch faces (e.g. Flow), Smart Stack hints, Live Translation in Messages, a Notes app, and more. 
Apple

Also includes Workout Buddy: a motivational, spoken companion during workouts that adjusts to your fitness data, using Apple Intelligence. 
Apple

Sustainability

Apple emphasizes more recycled content. 
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Manufacturing is powered by 100% renewable electricity. 
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Packaging is fully fiber-based and recyclable. 
Apple

Pros & Considerations

Pros

Great health-monitoring capabilities, especially with the new hypertension notifications.

Longer battery life compared to some past models, especially with fast charge.

Durable screen (better scratch resistance) + water/dust resistance.

5G support (on cellular model) improves connectivity.

Environmentally more sustainable with recycled materials.

Things to Think About

Although the battery life is rated at 24h, some users point out that Apple’s testing methodology includes sleep tracking, which may skew the numbers. 
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It uses the same S10 chip as previous models, so in terms of raw processing power, it’s not a major leap. 
MacRumors

Depending on your wrist size, the choice between 42mm and 46mm matters for comfort and aesthetics.