Apple Watch SE 3 40mm Midnight

The Apple Watch SE 3 (40mm, Midnight Aluminum) delivers essential health, fitness, safety, and connectivity features in a compact, lightweight form factor. Built with a 100% recycled midnight aluminum case paired with a color-matched nylon composite and sapphire crystal back, this 40mm model is sized for wrist circumferences between 130mm and 200mm.

Under the hood, the SE 3 is powered by the Apple S10 chip featuring a 64-bit dual-core processor, a 4-core Neural Engine, and 64GB of onboard storage. It fully supports Apple Intelligence and the all-new conversational Siri AI, alongside intuitive touch-free controls like single tap, double tap, and wrist flick gestures. The Always-On Retina LTPO OLED display reaches up to 1000 nits of peak brightness for clear outdoor legibility and dims down to 2 nits in dark environments, protected by an Ion-X front glass engineered to be 4x more crack-resistant than the previous generation.

Wellness tracking is powered by a second-generation optical heart sensor and a built-in wrist temperature sensor, enabling sleep apnea notifications, sleep scoring, irregular rhythm alerts, and retrospective ovulation estimates. Built-in emergency features include Fall Detection, Crash Detection, Emergency SOS, and Check In. The battery delivers up to 18 hours of normal use (or up to 32 hours in Low Power Mode), with fast charging that reaches 80% in approximately 45 minutes.

Key Features

• 40mm Midnight Aluminum Case: Compact profile with a 759 sq mm display area, weighing just 26.3g (GPS) / 26.4g (Cellular).

• Apple S10 Chip & 64GB Storage: Fast dual-core processing with a 4-core Neural Engine for on-device machine learning and Apple Intelligence.

• Always-On Retina LTPO OLED Display: Continuous visibility with 1000 nits peak brightness and tough Ion-X front glass.

• Wrist Temperature & Sleep Tracking: Supports sleep stages, sleep score, sleep apnea notifications, and advanced Cycle Tracking.

• Heart Health Monitoring: High/low heart rate warnings, irregular rhythm alerts, and cardiovascular fitness tracking.

• Comprehensive Safety Features: High-g accelerometer enables Crash Detection, Fall Detection, Emergency SOS, and Check In.

• 50m Water Resistance: Swimproof design suitable for pool and open-water swimming with automatic stroke detection and SWOLF metrics.

• Fast Charging Support: Up to 80% charge in ~45 minutes; 15 minutes of charging provides up to 8 hours of normal use.

• Gesture Navigation: Navigate one-handed using double tap and wrist flick gestures.

Full Specifications

• Brand: Apple

• Model: Apple Watch SE 3 (40mm)

• Product Type: Smartwatch

• Case Size: 40 mm (40mm × 34mm × 10.7mm)

• Wrist Fit: 130–200 mm

• Case Material: 100% Recycled Aluminum

• Back Material: Nylon Composite and Sapphire Crystal

• Color / Finish: Midnight Aluminum

• Display: Always-On Retina LTPO OLED Display (324 × 394 pixels, 759 sq mm, 326 ppi)

• Brightness: 1000 nits peak / 2 nits minimum

• Cover Glass: Ion-X Front Glass (4x crack resistance)

• Processor / Chipset: Apple S10 SiP (64-bit dual-core) + W3 Wireless Chip

• Neural Engine: 4-Core Neural Engine

• Storage Capacity: 64 GB

• Audio & Mic: Built-in Speaker (Media Playback supported) + Microphone with Voice Isolation

• Controls: Digital Crown with haptic feedback, Side button, Double tap & wrist flick gestures

• Sensors: Second-generation optical heart sensor, Temperature sensor, Compass, Always-on altimeter, High-g accelerometer, High dynamic range gyroscope, Ambient light sensor

• Health & Wellness: Vitals app, Sleep tracking, Sleep score, Sleep apnea notifications, Cycle Tracking (retrospective ovulation estimates, perimenopause/menopause support), High/low heart rate notifications, Irregular rhythm alerts, Noise app, Mindfulness app, Medications app

• Safety: Emergency SOS, International emergency calling, Fall Detection, Crash Detection, Check In, Backtrack

• Water Resistance: 50 meters (ISO standard 22810:2010; swimproof)

• Connectivity: Wi-Fi 4 (802.11n 2.4GHz), Bluetooth 5.3, GPS (L1 GPS, GLONASS, Galileo, QZSS, BeiDou), Apple Pay, GymKit; Cellular models support 5G (RedCap) & LTE

• Battery Life: Up to 18 hours normal use; up to 32 hours Low Power Mode; up to 7 hours workout tracking

• Charging: Fast-charge capable (0–80% in ~45 mins; 15 mins for 8 hrs normal use) via Magnetic Fast Charger to USB-C

• Operating System: watchOS

• Compatibility: iPhone 11 or later with iOS 27 or later

• In the Box: Apple Watch SE 3 (40mm), Band, Apple Watch Magnetic Fast Charger to USB-C Cable (1m)