Material and Finish Aluminum case Starlight, Midnight Size and Weight Height: 40mm Width: 34mm Depth: 10.7mm 324 by 394 pixels 759 sq mm display area Weight (GPS): 26.3 grams Weight (GPS Cellular): 26.4 grams Fits 130-200mm wrists Hardware and Buttons Digital Crown Microphone Side button Speaker/air vent Optical heart sensor Controls Digital Crown with haptic feedback Side button Double tap and wrist flick gestures Siri with on-device processing Chip S10 chip with 64-bit dual core processor 4-core Neural Engine 64GB capacity Sensors Second-generation optical heart sensor Temperature sensor Compass Always-on altimeter High-g accelerometer High dynamic range gyroscope Ambient light sensor Health and Wellness Cycle Tracking app with retrospective ovulation estimates Heart Rate app High and low heart rate notifications Irregular rhythm notifications3 Medications app Mindfulness app Noise app Sleep app including sleep stages Sleep score Sleep apnea notifications4 Display Always-On Retina display with OLED and LTPO Tough Ion-X front glass with 4x crack resistance Up to 1000 nits peak brightness 2 nits minimum brightness 326 pixels per inch Audio Speaker Microphone Media playback Power and Battery Life All-day battery life, up to 18 hours of normal use Up to 32 hours in Low Power Mode Built-in rechargeable lithium-ion battery Fast-charge capable7 Up to 80% charge in about 45 minutes 15 minutes for up to 8 hours of normal use 8 minutes for up to 8 hours of sleep tracking Operating System watchOS watchOS is the world’s most advanced wearable operating system, with apps and features designed to keep you active, healthy, safe, and connected. Workouts and Activity Running Custom workouts Customizable Workout Views Training Load Heart Rate Zones Race Route Pacer Stride Length, Ground Contact Time, and Vertical Oscillation Automatic track detection Multisport workout Hiking Compass with bearing, incline, elevation, and coordinates Custom waypoints Automatically generated waypoints to cellular connectivity Backtrack GPS data Offline maps with custom route creation Topographic maps for thousands of national and regional parks (U.S. only) Hundreds of curated hikes across all 63 U.S. national parks Cycling Average speed, elevation gained, and distance Connection to cycling accessories via Bluetooth Functional Threshold Power Power Zones Cadence Live Activity on iPhone Swimming Pool swim or open water swim Custom workouts for pool swims Splits and auto sets SWOLF score Automatic stroke detection Kickboard detection Average pace, total distance, and laps More Workouts Skiing Snowboarding Outdoor Rowing Paddling Golf Walk Elliptical Rower Stair Stepper HIIT Yoga Functional Stength Training Dance Cooldown Core Training Pilates Tai Chi Wheelchair Kickboxing Multisport Other Safety Emergency SOS9 International emergency calling Crash Detection9 Fall Detection Noise monitoring Backtrack Durability Water resistance 50m (swimproof) Connectivity L1 GPS, GNSS, Galileo, and QZSS 5G12 and LTE13 Wi-Fi 4 (802.11n) Support for 2.4GHz Wi-Fi networks Bluetooth 5.3 Apple Pay14 GymKit Support for Apple Watch For Your Kids International roaming16 Accessibility Built-in accessibility features supporting vision, mobility, hearing, and cognitive disabilities. Learn more Features include: VoiceOver Zoom On/Off Labels Reduce Transparency Increase Contrast Color Filters Text Size Bold Text Reduce Motion Hourly Chimes AssistiveTouch Button Click Speed Touch Accommodations Auto-Answer Calls Type to Siri RTT Support Audio Volume Balance Auto Transcription Live Speech Accessibility Shortcut Mono Audio Taptic Time Personal Voice Live Listen Environmental Requirements Operating temperature: 32 to 95 F (0 to 35 C) Nonoperating storage temperature: -4 to 113 F (-20 to 45 C) Relative humidity: 5% to 90% noncondensing Operating altitude: 0 feet to 10,000 feet (0m to 3000m) Apple Watch and the Environment Apple Watch SE 3 is designed to reduce environmental impact: Progress toward Apple 2030 Apple 2030 is our commitment to be carbon neutral for our entire carbon footprint. Our plan to decarbonize products is rigorous and focuses on transitioning to low-carbon electricity, designing with recycled and low-carbon materials, and prioritizing lower-carbon ways of shipping products, like ocean freight. See Apple’s commitment Materials Apple Watch SE 3 is made with 40% recycled content,18 including: 100% recycled aluminum in the case 100% recycled cobalt and 95% recycled lithium in the battery 100% recycled rare earth elements in all magnets 100% recycled gold plating and tin solder in all Apple-designed printed circuit boards 100% recycled tungsten in the Taptic Engine 40% recycled glass in the display glass Energy 100% of manufacturing electricity for Apple Watch SE 3 is sourced from renewable electricity 100% of expected customer energy use matched with low-carbon electricity Meets California Energy Commission’s energy efficiency standards for battery charger systems Packaging 100% fiber-based packaging Apple Watch SE 3 packaging is designed to be compact, enabling 40% more units per trip compared to Apple Watch SE Waste No established final assembly sites generate waste sent to landfill as part of Apple’s Zero Waste Program Smarter chemistry All of the materials used in Apple products, accessories, and packaging are covered by the requirements of our Regulated Substances Specification, which was one of the first in industry to restrict the use of key substances of concern. See the latest Environmental Progress Report to understand Apple’s recent efforts in phasing out these chemistries. Compatibility iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 26 or later What’s in the box Apple Watch SE 3 Band Apple Watch Magnetic Fast Charger to USB-C Cable (1m)