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Apple Watch SE 3 - Tech Specs

Year introduced: 2025

Material and Finish

Aluminium case

  • Starlight

  • Midnight

Size and Weight

  • 44 mm

  • Height: 44 mm

  • Width: 38 mm

  • Depth: 10.7 mm

  • 368 by 448 pixels

  • 977-sq-mm display area

  • Weight (GPS): 32.9 grams

  • Weight (GPS + Cellular): 33.0 grams

  • Fits 140–245-mm wrists

  • 40 mm

  • Height: 40 mm

  • Width: 34 mm

  • Depth: 10.7 mm

  • 324 by 394 pixels

  • 759-sq-mm display area

  • Weight (GPS): 26.3 grams

  • Weight (GPS + Cellular): 26.4 grams

  • Fits 130–200-mm wrists

Hardware and Buttons

  • Digital Crown

  • Microphone

  • Side button

  • Speaker/air vent

  • Optical heart sensor

Controls

  • Digital Crown with haptic feedback

  • Side button

  • Double tap and wrist flick gestures1

  • Siri with on‑device processing

Chip

  • S10 chip with 64‑bit dual core processor

  • 4‑core Neural Engine

  • 64GB capacity

Sensors

  • Second-generation optical heart sensor

  • Temperature sensor2

  • Compass

  • Always-on altimeter

  • High-g accelerometer

  • High-dynamic-range gyroscope

  • Ambient light sensor

Health and Wellness

  • Cycle Tracking app with retrospective ovulation estimates3

  • Heart Rate app

  • High- and low-heart-rate notifications

  • Irregular rhythm notifications4

  • Medications app

  • Mindfulness app

  • Noise app

  • Sleep app including sleep stages

  • Sleep score

  • Sleep apnoea notifications5

Display

  • Always-On Retina display with OLED and LTPO

  • Tough Ion-X front glass with 4x crack resistance6

  • Up to 1,000 nits peak brightness

  • 2 nits minimum brightness

  • 326 pixels per inch

Audio

  • Speaker

  • Microphone

  • Media playback

Power and Battery Life

  • All‑day battery life, up to 18 hours of normal use7

  • Up to 32 hours in Low Power Mode7

  • Built‑in rechargeable lithium‑ion battery

  • Fast‑charge–capable8

  • Up to 80% charge in about 45 minutes8

  • 15 minutes for up to 8 hours of normal use9

  • 8 minutes for up to 8 hours of sleep tracking9

Learn more about Power and Battery Life

Operating System

watchOS

watchOS is the world’s most advanced wearable operating system, with apps and features designed to keep you active, healthy, safe and connected.

Workouts and Activity

  • Running

  • Customised workouts

  • Customisable Workout Views

  • Training Load

  • Heart Rate Zones

  • Race Route

  • Pacer

  • Stride Length, Ground Contact Time and Vertical Oscillation

  • Automatic track detection

  • Multisport workout

  • Hiking

  • Compass with bearing, incline, elevation and coordinates

  • Customised waypoints

  • Automatically generated waypoints to mobile connectivity

  • Backtrack GPS data

  • Offline maps with customised route creation

  • Cycling

  • Average speed, elevation gained and distance

  • Connection to cycling accessories via Bluetooth®

  • Functional Threshold Power

  • Power Zones

  • Cadence

  • Live Activity on iPhone

  • Swimming

  • Pool swim or open-water swim

  • Custom Workouts for pool swims

  • Splits and auto sets

  • SWOLF score

  • Automatic stroke detection

  • Kickboard detection

  • Average pace, total distance and laps

More Workouts

  • Skiing

  • Snowboarding

  • Outdoor Rowing

  • Paddling

  • Golf

  • Walk

  • Elliptical

  • Rower

  • Stair Stepper

  • HIIT

  • Yoga

  • Functional Stength Training

  • Dance

  • Cooldown

  • Core Exercise

  • Pilates

  • Tai Chi

  • Wheelchair

  • Kickboxing

  • Multisport

  • Other

Safety

  • Emergency SOS10

  • International emergency calling11

  • Crash Detection10

  • Fall Detection

  • Noise monitoring

  • Backtrack

Durability

Water resistance 50 m (swim-proof)12

Connectivity

  • L1 GPS, GLONASS, Galileo, QZSS and BeiDou

  • 4G LTE13

  • Wi-Fi 4 (802.11n)

  • Support for 2.4GHz Wi-Fi networks

  • Bluetooth® 5.3

  • Apple Pay14

  • GymKit

  • Support for Apple Watch For Your Kids15

Accessibility

Built‑in accessibility features supporting vision, mobility, hearing and cognitive disabilities.

Learn more about Accessibility

Features include:

  • VoiceOver

  • Zoom

  • On/Off Labels

  • Reduce Transparency

  • Increase Contrast

  • Colour Filters

  • Text Size

  • Bold Text

  • Reduce Motion

  • Hourly Chimes

  • AssistiveTouch

  • Button Click Speed

  • Touch Accommodations

  • Auto-Answer Calls

  • Type to Siri

  • RTT Support

  • Audio Volume Balance

  • Auto Transcription

  • Live Speech

  • Accessibility Shortcut

  • Mono Audio

  • Taptic Time

  • Personal Voice

  • Live Listen

Environmental Requirements

  • Operating temperature: 0° to 35° C (32° to 95° F)

  • Nonoperating storage temperature: –20° to 45° C (−4° to 113° F)

  • Relative humidity: 5% to 90% noncondensing

  • Operating altitude: 0 m to 3,000 m (0 feet to 10,000 feet)

Apple Watch and the Environment

Apple Watch SE 3 is designed to reduce environmental impact:16

See the Apple Watch SE 3 Product Environmental Report (PDF)

Progress towards Apple 2030

  • Apple 2030 is our commitment to be carbon neutral for our entire carbon footprint. Our plan to decarbonise products is rigorous and focuses on transitioning to low-carbon electricity, designing with recycled and low-carbon materials, and prioritising lower-carbon ways of shipping products, like ocean freight.

See Apple’s commitment

Materials

Apple Watch SE 3 is made with 40% recycled content17, including:

  • 100% recycled aluminium in the case

  • 100% recycled cobalt and 95% recycled lithium in the battery

  • 100% recycled rare earth elements in all magnets

  • 100% recycled gold plating and tin solder in all Apple-designed printed circuit boards

  • 100% recycled tungsten in the Taptic Engine

  • 40% recycled glass in the display glass

Energy

  • 100% of manufacturing electricity for Apple Watch SE 3 is sourced from renewable electricity18

  • 100% of expected customer energy use matched with low-carbon electricity

  • Meets California Energy Commission’s energy efficiency standards for battery charger systems19

Packaging

  • 100% fibre-based packaging20

  • Apple Watch SE 3 packaging designed to be compact, enabling 40% more units per trip compared to Apple Watch SE

Waste

  • No established final assembly sites generate waste sent to landfill as part of Apple’s Zero Waste Program21

Smarter chemistry22

  • All of the materials used in Apple products, accessories and packaging are covered by the requirements of our Regulated Substances Specification, which was one of the first in industry to restrict the use of key substances of concern. See the latest Environmental Progress Report to understand Apple’s recent efforts in phasing out these chemistries.

Compatibility

iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 26 or later

In the Box

  • Apple Watch SE 3

  • Band

  • Apple Watch Magnetic Fast Charger to USB‑C Cable (1 m)

  1. Requires Apple Watch Series 9 or later, Ultra 2 or later, or SE 3.

  2. The temperature sensing feature is not intended for medical use. Temperature sensing is available only on Apple Watch Series 8 and later, Apple Watch SE 3 and all Apple Watch Ultra models.

  3. The Cycle Tracking app should not be used for birth control or to diagnose a health condition.

  4. Irregular rhythm notification requires the latest version of watchOS and iOS. It is not intended for use by people under 22 years old or those who have been previously diagnosed with atrial fibrillation (AFib). Always follow directions for use. The device is not intended to replace traditional methods of diagnosis. Consult a doctor if atrial fibrillation is detected or if you have symptoms of a heart attack, stroke or other cardiovascular conditions.

  5. Sleep apnoea notifications are available on Apple Watch Series 9 and later, Ultra 2 and later and SE 3. The feature is intended to detect signs of moderate to severe sleep apnoea for people aged 18 years or older without a diagnosis of sleep apnoea. Always follow directions for use. The feature is not intended for use in screening for, diagnosing, treating or managing sleep apnoea. Even without a notification, sleep apnoea may still be present. Consult a medical practitioner if you have symptoms of sleep apnoea, or any other breathing disturbance.

  6. Apple Watch SE 3 Ion-X glass is 4x more resistant to cracks than Apple Watch SE 2.

  7. All-day battery life is based on the following use: 300 time checks, 90 notifications, 15 minutes of app use, and a 60-minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours; Apple Watch SE 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 18-hour test; Apple Watch SE 3 (GPS + Cellular) usage includes a total of 4 hours of cellular connection and 14 hours of connection to iPhone via Bluetooth over the course of 18 hours. Battery life in Low Power Mode including sleep tracking is based on the following use: 430 time checks, 130 notifications, 20 minutes of app use, a 60-minute workout with music playback from Apple Watch via Bluetooth, and 6 hours of sleep tracking over the course of 32 hours; Apple Watch SE 3 (GPS) usage includes connection to iPhone via Bluetooth during the entire 32-hour test; Apple Watch SE 3 (GPS + Cellular) usage includes on-demand cellular connection and 24 hours of connection to iPhone via Bluetooth over the course of 32 hours. Testing conducted by Apple in July and August 2025 using preproduction Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with prerelease software. Battery life varies by use, configuration, cellular network, signal strength and many other factors; actual results will vary.

  8. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charger to USB-C Cable. Testing conducted by Apple in July and August 2025 using preproduction Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with prerelease software, Apple Watch Magnetic Fast Charger to USB-C Cable (Model A2515), and Apple 20W USB-C Power Adapter (Model A2305). Fast-charge testing conducted with drained Apple Watch units. Times measured from the appearance of the Apple logo as the unit started up. Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary.

  9. Testing conducted by Apple in July and August 2025 using preproduction Apple Watch SE 3 (GPS) and Apple Watch SE 3 (GPS + Cellular), each paired with an iPhone; all devices tested with prerelease software, Apple Watch Magnetic Fast Charger to USB-C Cable (Model A2515), and Apple 20W USB-C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage and environmental factors; actual results will vary.

  10. Emergency SOS requires a mobile network or Wi-Fi calling with an internet connection from your Apple Watch or nearby iPhone. You can use cellular models of Apple Watch to make an emergency call in many locations, provided that a mobile network is available. Some mobile networks may not accept an emergency call from your Apple Watch if your Apple Watch isn’t activated, if it isn’t compatible with or configured to operate on a particular mobile network, if it isn’t set up for mobile service, or if the mobile network does not support emergency calling over IMS. See support.apple.com/en-au/108374 and apple.com/au/watch/cellular for more information.

  11. International emergency calling requires an Apple Watch Series 5 (GPS + Cellular), Apple Watch SE (GPS + Cellular), Apple Watch Ultra or later. For a list of supported countries and regions, see apple.com/au/watchos/feature-availability.

  12. Apple Watch SE 3 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. Apple Watch SE 3 should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth. Water resistance is not a permanent condition and can diminish over time. For additional information, see support.apple.com/en-au/109522.

  13. Carrier plan required for cellular service. Contact your service provider for more details. Connection may vary based on network availability. International roaming is not supported. Check apple.com/au/watch/cellular for participating carriers and eligibility. See support.apple.com/en-au/HT207578 for additional setup instructions.

  14. To use Apple Pay you need a supported card from a participating card issuer. To check if your card is compatible with Apple Pay, contact your card issuer. Apple Pay is not available in all markets. View Apple Pay countries and regions.

  15. Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Carrier plan required for cellular service. Contact your service provider for more details. Check apple.com/au/watch/cellular for participating carriers and eligibility.

  16. Data accurate as of product launch.

  17. Product recycled or renewable content is the mass of certified recycled material relative to the overall mass of the device, not including packaging or in‑box accessories.

  18. Our manufacturing electricity is sourced from clean electricity, including a mix of supplier and Apple clean energy projects.

  19. Apple Watch SE 3 meets California Energy Commission’s Energy Efficiency Standards for Small Battery Charger Systems as outlined in the California Code of Regulations.

  20. Based on retail packaging as shipped by Apple. Breakdown of US retail packaging by weight. Adhesives, inks and coatings are excluded from our calculations of plastic content and packaging weight.

  21. All established final assembly supplier sites — those that have been Apple suppliers for more than one year — for Apple Watch SE 3 are third-party verified as Zero Waste by UL LLC (UL 2799 Standard). UL requires at least 90% diversion through methods other than waste to energy to achieve Zero Waste to Landfill (Silver 90–94%, Gold 95–99% and Platinum 100%) designations.

  22. Apple’s Regulated Substances Specification describes Apple’s restrictions on the use of certain chemical substances in materials in Apple products, accessories, manufacturing processes, and packaging used for shipping products to Apple’s end‑customers. Restrictions are derived from international laws or directives, regulatory agencies, eco‑label requirements, environmental standards, and Apple policies. Every Apple product is free of PVC and phthalates except for AC power cords in India, Thailand (for two‑prong AC power cords), and South Korea, where we continue to seek government approval for our PVC and phthalates replacement. Apple products comply with the European Union Directive 2011/65/EU and its amendments, including exemptions for the use of lead such as high‑temperature solder. Apple is working to phase out the use of these exempted substances for new products where technically possible.

Apple Watch Ultra 3, Apple Watch Series 11 and Apple Watch SE 3 require iPhone 11 or later with iOS 26 or later.

Features are subject to change. Some features, applications and services may not be available in all regions or all languages. View complete list.