Apple Watch SE (2nd Gen)

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

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Apple Watch SE (2nd Gen) at a glance

Battery

Charge most nights

Up to 18 hours in smartwatch mode.
GPS

Built-in GPS

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

LTPO OLED

Up to 1,000 nits.
Health

Heart rate and activity

Heart rate, steps and sleep.
Phone & smart

iPhone only

LTE and payments.
Build

5 ATM water rating

32.9 g. 2 case sizes.

Apple Watch SE (2nd Gen) full specifications

Overview

Brand	Apple
Model	Apple Watch SE (2nd generation)
Series	Apple Watch SE
Versions	44mm GPS + Cellular, 40mm GPS, 40mm GPS + Cellular
Colours	Midnight, Starlight, Silver

Platform & apps

Needs an iPhone, running watchOS.

Operating system	watchOS
Works with	iPhone only
Minimum iOS	iOS 18
Chipset	S8 SiP
Storage	32 GB

Display

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

Up to 1,000 nits.

Display type	LTPO OLED
Display name	Retina LTPO OLED
Resolution	368 x 448
Pixel density	326 ppi
Peak brightness	1,000 nits
Colour 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
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.

Real battery life depends on screen brightness, notifications and workouts.

Battery (smartwatch mode)	18 hours
All battery modes	Smartwatch: 18 hours
Battery type	Li-ion
Charging	puck
Wireless charging	Yes
Fast charging	0-80% in about 1.5 hours

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, Galileo, QZSS
Maps	Downloadable maps
Preloaded regions	U.S. only
Navigation features	waypoints, back-to-start

Health & sensors

Tracks heart rate and activity.

For sleep, it offers sleep stages. It can warn you about an irregular heart rhythm.

Sensors	optical HR, compass, 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
Sleep tracking	Sleep stages

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

Training

Tracks your workouts and daily activity.

It adds a triathlon mode.

Triathlon / multisport	Yes
Swim tracking	Pool and open water
Training metrics	training load, heart rate zones, Functional Threshold Power, Power Zones
Running dynamics	Yes
External sensors	Bluetooth sensors

Smart features

Smart extras include an LTE version and contactless payments.

Voice assistant: Siri. LTE needs a carrier plan.

Notifications	Yes
Speaker	Yes
Microphone	Yes
Voice assistant	Siri
Contactless payments	Yes
Payment service	Apple Pay
Cellular	LTE version available
Wi-Fi	Wi-Fi 4 (802.11n)
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.