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Apple Watch SE 3 shown with app icons floating around it, displaying fitness and messaging screens.

Image: Apple Inc.

Apple

Apple Watch SE 3

Fully verifiedSmartwatchReleased

Specs verified 2026-10-01 · source

Apple Watch SE 3 is Apple's 2025 entry-level smartwatch, featuring the S10 chip and available in 40mm and 44mm aluminum case sizes.

Official product page

At a glance

DisplayAlways-On Retina OLED, LTPO, 1000 nits peak brightness
Case sizes40mm case: 40 x 34 x 10.7mm; 44mm case: 44 x 38 x 10.7mm
ChipS10 (64-bit dual-core, 4-core Neural Engine)
BatteryUp to 18 hours of normal use
Water resistance50m (swimproof)
ConnectivityBluetooth 5.3
Sensors2nd-generation optical heart sensor, Skin temperature sensor
OSwatchOS

Device overview

Chip

Powered by S10 (64-bit dual-core, 4-core Neural Engine).

Health & sensors

Health and sensor features: 2nd-generation optical heart sensor, Skin temperature sensor.

Battery

Battery life: Up to 18 hours of normal use.

Connectivity

Supports Wi-Fi 4 (802.11n), Bluetooth 5.3, Cellular models (A3326, A3328) support RedCap 5G and LTE, and Apple Pay, GymKit.

Specifications

Design & Build
Water resistance50m (swimproof)
ColorsMidnight, Starlight
Weight
40mm aluminum (GPS):
26.3 g
44mm aluminum (GPS):
32.9 g
Case dimensions40mm case: 40 x 34 x 10.7mm; 44mm case: 44 x 38 x 10.7mm
Build materialsAluminum case
Display
DisplayAlways-On Retina OLED, LTPO, 1000 nits peak brightness
Peak brightness1000 nits
Resolution
40mm:
324×394 px
44mm:
368×448 px
Performance
Chipset model nameS10
ChipsetS10 (64-bit dual-core, 4-core Neural Engine)
Memory & Storage
Storage64 GB
Battery & Charging
Charging timeUp to 80% charge in about 45 minutes
Battery lifeUp to 18 hours of normal use
Connectivity
Wi-FiWi-Fi 4 (802.11n)
BluetoothBluetooth 5.3
Contactless paymentsApple Pay, GymKit
Cellular connectivityCellular models (A3326, A3328) support RedCap 5G and LTE
Software
Operating system at launchwatchOS
Phone compatibilityiPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later
Security & Sensors
Health sensors2nd-generation optical heart sensor, Skin temperature sensor

Sources & verification

This device is fully verified: every required fact is confirmed from a Tier 1 (manufacturer/official) source.

Tier 1 sources are the manufacturer's own product pages, technical specification sheets, or support documentation. Tier 2 sources are reputable independent technical references, used only for facts that couldn't be confirmed from official documentation. Last verified 2026-10-01.