Apple Watch SE 3
Quick details
Released
September 2025
Dimensions
44 x 38 x 10.7 mm; 40 x 34 x 10.7 mm
Operating system
watchOS
Display 40 mm or 44 mm case Always-On Retina LTPO OLED
Battery life Up to 18 hours; up to 32 hours in Low Power Mode
Water resistance 5 ATM; ISO 22810:2010
GPS Yes
Sensors Optical heart rate, temperature, compass, altimeter, accelerometer, gyroscope, ambient light
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Technical specifications
General
Release date 2025-09-19
Product type Smartwatch
Physical size 44 x 38 x 10.7 mm; 40 x 34 x 10.7 mm
Weight 44 mm: 32.9 g (GPS), 33.0 g (GPS + Cellular); 40 mm: 26.3 g (GPS), 26.4 g (GPS + Cellular)
Material Aluminum case
Water resistance 5 ATM; ISO 22810:2010
Color options Starlight, Midnight
Display type Always-On Retina LTPO OLED
Display size 40 mm or 44 mm case
Display resolution 40 mm: 324 x 394 pixels; 44 mm: 368 x 448 pixels
Display brightness Up to 1,000 nits
Display protection Tough Ion-X front glass; 4x more crack resistant than Apple Watch SE 2
Battery Built-in rechargeable lithium-ion battery
Battery life Up to 18 hours; up to 32 hours in Low Power Mode
Charging USB-C magnetic fast charging; up to 80% in about 45 minutes
Sensors
GNSS type Built-in GNSS
GPS Yes
GALILEO Yes
GLONASS Yes
QZSS Yes
Beidou Yes
Accelerometer Yes
Gyroscope Yes
Barometric altimeter Yes
Compass Yes
Ambient light sensor Yes
Optical heart rate Yes
Electrical heart rate No
SpO2 No
Temperature Yes
Galvanic skin response No
Microphone Yes
Speakers Yes
Vibration motor Yes
Health & activity tracking
Steps Yes
Distance Yes
Calories burned Yes
Floors Yes
Sports tracking Yes
Sleep Yes
Heart rate Yes
HRV Yes
Stress No
Blood oxygen No
Respiration rate Yes
Skin temperature Yes
ECG No
Blood pressure No
Body composition No
Glucose No
Hydration level No
UV exposure No
Calorie intake No
Hyperglycemia risk assessment No
Arterial stiffness detection No
Pulse wave arrhythmia analysis Yes
Daily smart features
Smartphone compatibility iPhone 11 or later with iOS 26 or later
Operating system at launch watchOS
Processor Apple S10, 64-bit dual-core; 4-core Neural Engine
Storage 64 GB
Bluetooth Yes (5.3)
Wi-Fi Yes (Wi-Fi 4 / 802.11n, 2.4 GHz)
NFC / connected pay Yes (Apple Pay)
UWB No
Cellular Optional (5G RedCap and LTE on supported regional models)
Smartphone notifications Yes
Bluetooth calling Yes (standalone on cellular models; via paired iPhone otherwise)
Smartphone music control Yes
On-board music storage Yes
Voice assistant Siri
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These technical specs are correct to the best of our knowledge at the time of publishing.
