Refurbished Apple Watch SE 3 (40mm & 44mm) - Product Features & Specifications

Key Features & Highlights

Always-On Retina Display with up to 1,000 nits brightness for excellent visibility
S10 chip with 64-bit dual-core processor and 4-core Neural Engine
Advanced health insights including heart rate monitoring, sleep stages, sleep score and sleep apnoea notifications
Wrist temperature sensing for deeper wellness insights and Cycle Tracking with retrospective ovulation estimates
Comprehensive workout tracking with GPS, Activity rings and customisable workouts
Safety features including Crash Detection, Fall Detection and Emergency SOS
Up to 18 hours battery life, or up to 32 hours using Low Power Mode
Fast charging support for quick power top-ups
Water resistant to 50 metres, suitable for swimming
watchOS with on-device Siri, intuitive gestures and Smart Stack

Case, Finish & Size

Case Material: Aluminium
Colour Options: Starlight, Midnight
40mm Case: 40mm height × 34mm width × 10.7mm depth
44mm Case: 44mm height × 38mm width × 10.7mm depth
Front Glass: Tough Ion-X glass with enhanced crack resistance

Display

Display Type: Always-On Retina OLED LTPO display
40mm Resolution: 324 × 394 pixels, 759 sq mm display area
44mm Resolution: 368 × 448 pixels, 977 sq mm display area
Brightness: Up to 1,000 nits maximum, 2 nits minimum
Pixel Density: 326 pixels per inch

Performance & Storage

Chip: S10 SiP with 64-bit dual-core processor
Neural Engine: 4-core
Storage Capacity: 64GB

Sensors

Heart Sensor: Second-generation optical heart sensor
Temperature Sensor: Wrist temperature sensing
Motion Sensors: High-g accelerometer, high-dynamic-range gyroscope
Other Sensors: Compass, always-on altimeter, ambient light sensor

Health & Wellness Features

Heart Rate Monitoring: High and low heart rate notifications
Irregular Rhythm Notifications
Sleep Tracking: Sleep stages, sleep score and sleep apnoea notifications
Cycle Tracking: Retrospective ovulation estimates
Wellness Apps: Medications, Mindfulness, Noise and Vitals apps

Workouts & Activity

Activity Tracking: Move, Exercise and Stand rings
Workouts: Running, cycling, swimming, HIIT, yoga, Pilates, strength training and more
GPS Tracking: Distance, pace, route and elevation
Advanced Metrics: Heart rate zones, training load and custom workout views

Safety Features

Emergency SOS
Crash Detection
Fall Detection
Check In and location sharing
Medical ID

Connectivity

GPS Models: GPS, Wi-Fi and Bluetooth
GPS + Cellular Models: GPS, Wi-Fi, Bluetooth, 4G LTE and 5G RedCap support
Wireless: Wi-Fi 4 (2.4GHz), Bluetooth 5.3
Location: L1 GPS with support for multiple satellite systems

Battery & Charging

Battery Life: Up to 18 hours of normal use
Low Power Mode: Up to 32 hours
Charging: Fast-charge capable
Typical Charge Time: Up to 80% in around 45 minutes

Durability

Water Resistance: Rated to 50 metres (swim-proof)

Operating System & Compatibility

Operating System: watchOS
Compatibility: iPhone 11 or later with iOS 26 or later

Model Numbers:

A3326 - GPS + Cellular 40mm
A3328 - GPS + Cellular 44mm
A3324 - GPS only 40mm
A3325 - GPS only 44mm

Product Disclaimers & Footnotes

Temperature sensing is not intended for medical use. The Vitals app and Cycle Tracking app are for wellness purposes only and are not intended for medical diagnosis or birth control. Sleep apnoea notifications are intended to detect signs of moderate to severe sleep apnoea for adults aged 18 years or older without a prior diagnosis and are not a substitute for medical advice.

Battery life varies by use, configuration, network conditions and other factors. Fast-charge testing was conducted by Apple using pre-production devices and Apple-approved accessories. Actual charging times may vary.

Emergency SOS requires a mobile network connection or Wi-Fi calling. Cellular features require an active compatible service plan. Availability and performance may vary by carrier and region. International roaming is not supported.

Apple Watch SE 3 is water resistant to 50 metres under ISO standard 22810:2010 and is suitable for shallow-water activities such as swimming. Water resistance is not a permanent condition and may diminish over time.

Some features, applications and services may not be available in all regions or languages and are subject to change. Apple Watch SE 3 requires a compatible iPhone and Apple ID.

Apple Watch Series SE

Watch SE3 2025 40mm GPS (Refurbished)