Official manufacturer render.
Apple
Apple Watch SE 3 40mm
- Retina LTPO OLED
- Apple S10 SiP
- 26 g
Available colors
Selected: Midnight
Physical specifications
—
Display size
26 g
Weight
40.0 mm
Height
34.0 mm
Width
10.7 mm
Thickness
—
Aspect ratio
Everyday usability
Estimated from the watch’s size, weight, battery, display, and intended wearing conditions.
Wrist comfort
Very comfortableIts compact case and low body weight should remain comfortable throughout a full day.
Sleep comfort
ComfortableIts size and weight should remain comfortable for most users overnight.
Battery usability
Data unavailableAvailable battery information is insufficient for a reliable daily-use assessment.
Screen and controls
Easy to useDetailed brightness information is unavailable, so outdoor visibility cannot be fully assessed.
Workout usability
ExcellentIts low weight, water resistance, and GPS support make it well suited to running and gym sessions.
See its real size next to another watch.
Compare watchesDisplay
- Display technology
- Retina LTPO OLED
- Resolution
- 324 × 394
- Protection
- Ion-X glass
Performance
- Chipset
- Apple S10 SiP
- Storage
- 64 GB
- Expandable storage
- No
Battery & charging
- Charging standard
- Apple Watch Magnetic Fast Charger
- Battery type
- Built-in rechargeable lithium-ion
Build & durability
- Frame
- Aluminum
- Front
- Ion-X glass
- Ingress protection
- Water resistance 50m
Connectivity
- Cellular
- LTE (GPS + Cellular models)
- Wi‑Fi
- Wi‑Fi 4 (802.11n)
- Bluetooth
- Bluetooth 5.3
- NFC
- Yes
Release and pricing
- Announced
- September 9, 2025
- Released
- September 19, 2025
Buying guide FAQ
Practical upgrade and buying answers based on published specifications and previous-generation comparisons when available.
Who should buy Apple Watch SE 3 40mm (2025)?
Apple Watch SE 3 40mm (2025) fits buyers who prefer a compact phone footprint. This is an editorial reading of size and published differences, not a personalized recommendation.
Similar size devices
Models and configurations
- Storage
- 64 GB
- Connectivity
- LTE (GPS + Cellular models)
- Colors
- MidnightStarlight
Official sources
Dimensions and specifications are based on manufacturer-published data. Learn more in our Methodology