Apple Watch SE 3rd Gen

Model & Lineup

• Model name: Apple Watch SE (3rd Generation)

• Sizes: 40 mm, 44 mm

• Finishes: Starlight (aluminum), Midnight (aluminum)

Case

• Material: 100% recycled aluminum case

• Case finishes: Starlight, Midnight

Display

• Type: Retina display with Ion-X glass (more crack resistant than prior SE)

• Sizes & resolution:

  • 40 mm — (display dimensions per Apple)

  • 44 mm — (display dimensions per Apple)

• Always On: Supported (improved display behavior / low power modes)

Processor & Performance

• Chip: Apple S-series (SE 3 uses an Apple S-series chip with improved performance vs SE 2)

• watchOS: Ships with the current watchOS version supported at launch; supports watchOS updates.

Sensors & Health

• Heart sensor (optical heart rate)

• Wrist temperature sensor (for retrospective ovulation estimates and temperature insights)

• Accelerometer, gyroscope, and high-g accelerometer (for Crash Detection and Fall Detection)

• Ambient light sensor

• Other: Sleep tracking, daily sleep score, and other watchOS health features

Connectivity

• Models: GPS and GPS + Cellular variants

• Bluetooth: Supported (version per Apple spec)

• Wi-Fi: 802.11b/g/n/AC (per Apple spec)

• Cellular: Available on GPS + Cellular models — carrier service required

• GPS: Built-in GPS/GNSS

Audio & Mic

• Built-in speaker and microphone — supports phone calls and Siri

• Media playback via speaker / paired Bluetooth audio

Battery & Charging

• Battery life: All-day battery (typical use) — Apple-stated battery life varies by test scenario (see manufacturer details)

• Charging: Magnetic charging cable (USB-C magnetic fast charge supported where specified)

Durability

• Water resistance: Swim-proof (water resistant to 50 meters) — suitable for shallow-water activities, not for scuba diving or high-pressure water sports

• Front glass: Ion-X strengthened glass (improved crack resistance)

Fit

• Fits wrist sizes: Approx. 140–220 mm (varies by band and size — check band sizing)

Weight (approx)

• 40 mm (GPS): lighter weight (per Apple)

• 44 mm (GPS): ~32.9 grams (44mm GPS example listed; weights vary by model & cellular add-on)

Included in the Box

• Apple Watch SE (configured size/model)

• Sport Band (size varies by SKU)

• Apple Magnetic Fast Charger to USB-C Cable (or as specified by region)

• Documentation

Compatibility

• Requires iPhone with the compatible iOS version (check Apple’s minimum iOS requirement for pairing and full functionality)

Software & Features

• watchOS with Workout app, Activity, Sleep, Vitals insights (daily sleep score), Crash Detection, Fall Detection, Notifications, App Store access on watch, Siri, Maps, Wallet, and more.

• Supports third-party watchOS apps.

What’s the difference between the Apple Watch SE (3rd Gen) GPS and GPS + Cellular models?

The GPS model requires an iPhone nearby for calls, messages, and data; the GPS + Cellular model can make calls, send messages, and use data independently when away from the iPhone (requires a carrier plan and activation).

Is the Apple Watch SE (3rd Gen) suitable for swimming and workouts?

Yes — it is water resistant to 50 meters and suitable for pool and open-water swims and regular workouts. It’s not intended for high-velocity water sports or scuba diving.

Will my older Apple Watch bands fit the SE (3rd Gen)?

Yes — bands designed for 40mm and 44mm Apple Watch cases are compatible. Confirm the band size (40mm/44mm) when ordering.