Apple Watch SE 1 Specifications: Complete Technical Guide in 2026
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After spending months researching discontinued Apple products, I’ve noticed the Apple Watch SE 1st generation remains incredibly popular in the second-hand market.
The Apple Watch SE 1st generation is Apple’s discontinued entry-level smartwatch featuring the S5 chip, Retina LTPO OLED display, and comprehensive health tracking capabilities released in September 2020.
Many buyers struggle to find accurate specifications for this model since Apple removed it from their website after discontinuing it in 2022.
This guide provides every technical specification you need, from processor details to exact dimensions, helping you make an informed purchase decision in 2026.
Complete Apple Watch SE 1 Technical Specifications (2026)
The Apple Watch SE 1st generation offers a carefully balanced set of specifications designed to provide essential smartwatch features at a lower price point.
⚠️ Important: The Apple Watch SE 1st generation was discontinued in September 2022 and is only available through third-party sellers or the used market.
| Specification | 40mm Model | 44mm Model |
|---|---|---|
| Processor | Apple S5 SiP with 64-bit dual-core processor | |
| Storage | 32GB internal storage | |
| RAM | 1GB (unofficial, based on teardowns) | |
| Display Size | 324 x 394 pixels | 368 x 448 pixels |
| Display Area | 759 sq mm | 977 sq mm |
| Case Dimensions | 40 x 34 x 10.4mm | 44 x 38 x 10.4mm |
| Weight (GPS) | 30.1g | 36.4g |
| Weight (GPS + Cellular) | 30.5g | 36.5g |
| Water Resistance | 50 meters (5 ATM) | |
| Battery Life | Up to 18 hours | |
The model numbers vary by configuration: A2351 (40mm GPS), A2352 (40mm GPS + Cellular), A2353 (44mm GPS), and A2354 (44mm GPS + Cellular).
These specifications remained unchanged throughout the product’s lifecycle from September 2020 to September 2022.
Design and Display Specifications
The Apple Watch SE 1st generation features a Retina LTPO OLED display with 1000 nits peak brightness.
Both size options use Ion-X strengthened glass for display protection, which provides good scratch resistance for daily wear.
Display Technology Details
The LTPO (Low Temperature Polycrystalline Oxide) technology enables efficient power management by dynamically adjusting refresh rates.
The 40mm model achieves 326 pixels per inch, while the 44mm model maintains the same pixel density despite its larger screen.
Unlike the Series 6, this display doesn’t support always-on functionality, requiring a wrist raise or tap to activate.
Case Materials and Finishes
Apple manufactured the SE 1 exclusively in aluminum, offering three color options: Silver, Space Gray, and Gold.
The aluminum case weighs significantly less than stainless steel alternatives, making it comfortable for all-day wear.
The case back uses a composite material with built-in sensors rather than the ceramic back found on premium models.
✅ Pro Tip: The 44mm model offers 29% more screen area than the 40mm, making it better for users who frequently interact with apps or read messages.
Performance and Processing Power
The Apple S5 System in Package (SiP) delivers performance identical to the Apple Watch Series 5.
This 64-bit dual-core processor runs at approximately 1.8 GHz based on performance benchmarks.
Processing Capabilities
The S5 chip handles watchOS operations smoothly, including app launches, notifications, and fitness tracking.
App loading times average 1-2 seconds for native apps and 2-4 seconds for third-party applications.
The processor supports background app refresh, allowing fitness apps to track continuously without draining battery excessively.
Storage and Memory Specifications
The 32GB storage capacity accommodates approximately 8GB of music, hundreds of apps, and extensive workout history.
After accounting for watchOS and pre-installed apps, users typically have 24-26GB available storage.
The 1GB RAM (unofficial specification) enables smooth multitasking between 3-4 active applications.
“The S5 chip in the Apple Watch SE delivers 2x faster performance than the Series 3 processor.”
– Apple Technical Specifications, 2020
Health and Fitness Tracking Capabilities
The Apple Watch SE 1st generation includes comprehensive health monitoring through multiple integrated sensors.
Sensor Specifications
The optical heart sensor uses green LED lights paired with light-sensitive photodiodes to detect blood flow.
Heart rate measurements range from 30-210 beats per minute with ±2 BPM accuracy during rest.
The accelerometer tracks movement with up to 32 g-forces measurement capability and 1000 Hz sampling rate.
Fitness Tracking Features
The three-axis gyroscope enables accurate rotation and orientation tracking for swimming and other activities.
GPS accuracy typically achieves within 5 meters in open sky conditions, improving to 3 meters with clear satellite visibility.
The altimeter provides real-time elevation data with 1-foot resolution for hiking and stair climbing metrics.
- Workout Types: Supports 16 workout types including running, cycling, swimming, and yoga
- Activity Rings: Tracks Move (calories), Exercise (minutes), and Stand (hours) goals
- Fall Detection: Automatically detects hard falls and can call emergency services
- Noise Monitoring: Alerts when environmental sound levels may affect hearing
The SE 1 lacks the ECG sensor and blood oxygen monitoring found in Series 6 and newer models.
Battery Life and Connectivity Options
Apple rates the Watch SE 1st generation for 18 hours of typical use on a single charge.
Real-world battery life varies between 14-24 hours depending on usage patterns and settings.
Battery Performance Details
GPS workout tracking consumes approximately 6-7% battery per hour of continuous use.
Music streaming over LTE (cellular models) drains roughly 10-12% per hour.
Charging from 0-80% takes approximately 90 minutes using the included magnetic charging cable.
Connectivity Specifications
| Technology | Specification | Details |
|---|---|---|
| Wi-Fi | 802.11b/g/n 2.4GHz | For faster app downloads and software updates |
| Bluetooth | 5.0 | Low energy protocol for iPhone connection |
| NFC | Supported | Apple Pay transactions only |
| LTE/UMTS | Optional | Cellular models support eSIM technology |
| GPS | GPS/GNSS | Built-in for location tracking without iPhone |
⏰ Time Saver: Enable Power Reserve mode when battery drops below 10% to maintain time display for up to 72 additional hours.
Software Compatibility and Requirements
The Apple Watch SE 1st generation launched with watchOS 7 and supports updates through watchOS 10.
Apple will likely continue software support through watchOS 11 or 12 based on historical patterns.
iPhone Compatibility Requirements
Initial setup requires an iPhone 6s or later running iOS 14 or newer.
As of 2026, the watch works with iPhone models from iPhone 6s through iPhone 16 series.
Family Setup allows parents to manage watches for children without requiring the child to have an iPhone.
watchOS Version History
- watchOS 7: Original shipping version with sleep tracking and handwashing detection
- watchOS 8: Added Focus modes, Mindfulness app, and portrait watch faces
- watchOS 9: Introduced new watch faces, improved Workout app, and medication tracking
- watchOS 10: Redesigned apps with Smart Stack and improved cycling metrics
Each major update typically requires 1-3GB of available storage for installation.
Is the Apple Watch SE 1 Worth Buying in 2026?
The Apple Watch SE 1st generation represents solid value at current second-hand prices ranging from $120-180.
I’ve tracked pricing across multiple platforms and found refurbished units from reputable sellers offer the best reliability-to-cost ratio.
Value Proposition Analysis
At roughly 40-50% of the original $279 retail price, the SE 1 delivers 80% of flagship Apple Watch functionality.
The S5 processor remains capable for all current watchOS features except the most demanding new applications.
Battery degradation on 3-4 year old units typically shows 85-90% of original capacity based on user reports.
When to Buy the SE 1
Ideal scenarios for purchasing:
- First-time Apple Watch users wanting to test the ecosystem
- Budget-conscious buyers needing basic fitness tracking
- Parents setting up Family Setup for children
- Users replacing a broken Series 3 or earlier model
When to Consider Alternatives
Skip the SE 1 if you need:
- Always-on display for quick time checks
- ECG or blood oxygen monitoring capabilities
- Latest processor for future watchOS updates beyond 2026
- Brand new device with full warranty coverage
The Apple Watch SE 2nd generation costs $249 new and includes the S8 chip, crash detection, and guaranteed longer software support.
Frequently Asked Questions
What chip does the Apple Watch SE 1st generation use?
The Apple Watch SE 1st generation uses the Apple S5 System in Package (SiP) with a 64-bit dual-core processor, the same chip found in the Apple Watch Series 5.
How much storage does the Apple Watch SE 1 have?
The Apple Watch SE 1st generation includes 32GB of internal storage, with approximately 24-26GB available for user content after accounting for watchOS and system files.
Is the Apple Watch SE 1 water resistant?
Yes, the Apple Watch SE 1st generation has water resistance up to 50 meters (5 ATM rating), making it suitable for swimming in pools and ocean water but not for scuba diving or high-velocity water activities.
What’s the difference between 40mm and 44mm Apple Watch SE?
The 44mm model has a larger display (368 x 448 pixels vs 324 x 394), weighs about 6 grams more, and offers 29% more screen area, while both models share identical internal specifications and features.
Does Apple Watch SE 1 have always-on display?
No, the Apple Watch SE 1st generation does not support always-on display. The screen turns off when lowered and requires a wrist raise, tap, or Digital Crown press to activate.
What iPhone is required for Apple Watch SE 1st generation?
The Apple Watch SE 1st generation requires an iPhone 6s or later running iOS 14 or newer for initial setup and daily use, though it can operate independently for certain functions after setup.
Final Thoughts on Apple Watch SE 1 Specifications
After analyzing every specification and comparing prices across multiple platforms, the Apple Watch SE 1st generation remains a capable smartwatch in 2026.
The combination of the S5 processor, comprehensive health tracking, and solid build quality delivers excellent functionality for budget-conscious buyers.
While it lacks cutting-edge features like always-on display and advanced health sensors, the core Apple Watch experience remains intact.
For anyone considering their first Apple Watch or replacing an aging model, the SE 1 offers compelling value at current second-hand prices under $200.