40mm case: 324 by 394 pixels, 759 sq mm display area.
44mm case: 368 by 448 pixels, 977 sq mm display area.
Protection: Tough Ion-X front glass, offering up to 4x better crack resistance than the previous generation.
Performance and battery
Chip: S10 chip with 64-bit dual-core processor and a 4-core Neural Engine.
Storage: 64GB capacity.
Battery:
Battery life: Up to 18 hours of normal use or up to 32 hours in Low Power Mode.
Charging: Supports fast charging, reaching up to 80% charge in approximately 45 minutes.
Connectivity
Wireless: Wi-Fi 4 (802.11n) for 2.4GHz networks and Bluetooth 5.3.
Location: L1 GPS, GLONASS, Galileo, QZSS, and BeiDou.
Cellular (optional): Available with an optional 5G cellular modem.
Sensors
Heart: Second-generation optical heart sensor.
Motion: Compass, always-on altimeter, high-g accelerometer, and high-dynamic-range gyroscope.
Health: Temperature sensor (for retrospective ovulation estimates), and ambient light sensor.
Features
The Apple Watch SE 3 offers many of the same core features as Apple’s flagship watches, with the notable exception of the ECG app and blood oxygen monitoring.
Health tracking: Provides heart rate notifications (high and low), sleep tracking with a new sleep score, temperature sensing, and irregular rhythm notifications.
Fitness tracking: A wide range of workout metrics, including custom workouts and the new Workout Buddy feature powered by Apple Intelligence.
Safety features: Includes Fall Detection, Crash Detection, and Emergency SOS.
Gestures: Supports the new double tap and wrist flick gestures for easy one-handed control.
Water resistance: Rated water resistant up to 50 meters, making it suitable for swimming.