Apple Watch SE 3

Works with: iPhone only
Display: LTPO OLED
Case sizes: 40 / 44 mm
Battery: 18 hours
GPS battery: 7 hours
Water resistance: 5 ATM
Weight: 32.9 g
Cellular: 5G version

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Apple Watch SE 3 at a glance

Battery

Charge most nights

Up to 18 hours in smartwatch mode. 7 hours with GPS.
GPS

Built-in GPS

Maps on the wrist. Runs and rides without your phone.
Display

LTPO OLED

Up to 1,000 nits and always-on option.
Health

Heart, sleep and more

Measures skin temperature.
Phone & smart

iPhone only

LTE, payments, music and calls.
Build

5 ATM water rating

32.9 g. 2 case sizes.

Apple Watch SE 3 full specifications

Overview

Brand	Apple
Model	Apple Watch SE 3
Series	Apple Watch SE
Replaces	Apple Watch SE 2
Versions	44mm, 40mm
Colours	Midnight, Starlight

Platform & apps

Needs an iPhone, running watchOS.

Operating system	watchOS
Works with	iPhone only
Minimum iOS	iOS 27
Chipset	S10
Storage	64 GB

Display

A vivid, high-contrast screen that is easy to read indoors and out.

Up to 1,000 nits and always-on option.

Display type	LTPO OLED
Display name	Always-On Retina display
Resolution	368 x 448
Pixel density	326 ppi
Peak brightness	1,000 nits
Colour display	Yes
Always-on display	Yes
Controls	crown, buttons

Design & durability

Comes in 2 case sizes (40, 44 mm) weighing 32.9 g.

Rated 5 ATM: fine for swimming laps and showers.

Case sizes	40 / 44 mm
Case shape	Rectangular
Dimensions	44 x 38 x 10.7 mm
Thickness	10.7 mm
Weight (case)	32.9 g
Case material	Aluminum
Lens	Ion-X
Fits wrists	140-245 mm
Water resistance	5 ATM
Water standard	ISO 22810:2010
Operating temperature	0 to 35 °C
Max altitude	3,000 m

Battery

Charge most nights: up to 18 hours in smartwatch mode.

With GPS on, up to 7 hours. Real battery life depends on screen brightness, notifications and workouts.

Battery (smartwatch mode)	18 hours
Battery (GPS)	7 hours
All battery modes	Smartwatch: 18 hours; Battery saver: 32 hours; GPS: 7 hours
Battery type	Li-ion
Charging	puck
Wireless charging	Yes
Fast charging	Up to 80% charge in about 45 minutes

GPS & navigation

Built-in GPS, so you can record runs and rides without your phone.

You can download maps to the watch.

GPS	Built-in
Satellite systems	GPS, GLONASS, Galileo, QZSS, BeiDou
Maps	Downloadable maps
Preloaded regions	U.S. national and regional parks
Navigation features	back-to-start, waypoints

Health & sensors

Tracks heart rate around the clock, plus skin temperature.

For sleep, it offers a nightly sleep score. It can warn you about an irregular heart rhythm.

Sensors	optical HR, skin temperature, compass, altimeter, accelerometer, gyroscope, ambient light
Heart-rate sensor	Second-generation optical heart sensor
Heart-rate tracking	24/7
Irregular rhythm alerts	Yes
High/low heart-rate alerts	Yes
Skin temperature	Yes
Sleep tracking	Sleep score
Sleep apnea alerts	Yes
Cycle tracking	Yes

Safety

Detects hard falls and can call for help if you don't respond.

SOS works over its own LTE connection.

Emergency SOS	From the watch (LTE)
Fall detection	Yes
Crash detection	Yes
Check-ins	Yes

Training

Tracks your workouts and daily activity.

It adds a triathlon mode and running power.

Triathlon / multisport	Yes
Swim tracking	Pool and open water
Training metrics	VO2 max, training load
Running dynamics	Yes
Wrist running power	Yes
External sensors	power meter, speed/cadence

Smart features

Smart extras include an LTE version, contactless payments, music storage and calls on the wrist.

Voice assistant: Siri. LTE needs a carrier plan.

Notifications	Yes
Calls on the watch	Yes
Speaker	Yes
Microphone	Yes
Voice assistant	Siri
Contactless payments	Yes
Payment service	Apple Pay
Cellular	5G version available
Music storage	Yes
Wi-Fi	Wi-Fi 4 2.4 GHz
Bluetooth	Bluetooth 5.3

Diving, golf & more

Specialist modes	golf, ski
Diving	None

Specs compiled from Apple's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.