Apple Watch Series 9 [GPS 45mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band M/L. Fitness Tracker, ECG Apps, Always-On Retina Display, Water Resistant Midnight Aluminum Case with Midnight Sport Band 45mm Case M/L - fits 160–210mm wrists
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The Apple Watch Series 9 contains blood oxygen monitoring hardware, but this feature is currently disabled on new units sold in the United States due to ongoing patent litigation with Masimo Corporation.

Current Availability Status:

US Market: Blood oxygen monitoring is disabled on all new Apple Watch Series 9 units following an International Trade Commission ruling in late 2023.

International Markets: The blood oxygen feature remains fully functional on Series 9 models purchased outside the United States.

Pre-Ban Units: Apple Watch Series 9 models purchased in the US before the legal restriction retain full blood oxygen monitoring capability.

Legal Background: The feature removal resulted from a patent dispute with Masimo Corporation regarding pulse oximetry technology. This restriction is expected to continue until relevant patents expire, potentially around 2028.

Alternative Options:

  • Purchase from international retailers (warranty limitations may apply)
  • Consider other devices with blood oxygen monitoring (select Fitbit models, medical-grade pulse oximeters)
  • Wait for potential legal resolution

Unaffected Health Features: All other Apple Watch Series 9 health monitoring capabilities remain fully operational:

  • Heart rate monitoring and notifications
  • ECG readings and atrial fibrillation detection
  • Sleep tracking and sleep apnea detection
  • Cycle tracking and other wellness features

Bottom Line: While the blood oxygen restriction is disappointing for US buyers, the Apple Watch Series 9 remains a comprehensive health and fitness tracker with extensive monitoring capabilities across all other wellness metrics.

Lowest at Amazon
$329.00 at Amazon
Lowest at any Popular Retailer
$329.00 at Amazon

Where to Buy

Prices last updated: September 3rd 2025 8:04 am

Considering the Apple Watch Series 9 45mm?

Here's our "TLDR" Review

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More Answers

If you're still curious about the Apple Watch Series 9 45mm, here are some other answers you might find interesting:

Yes, the Apple Watch Series 9 is fully compatible with third-party bands, providing significant cost savings and expanded customization options compared to Apple's official band selection.

Third-Party Band Advantages:

Cost Effectiveness: Third-party bands typically range from -, compared to Apple's official bands priced between -, offering substantial savings for style variety.

Design Variety: Extensive selection includes sport bands, leather straps, metal bracelets, fabric loops, and specialty bands for specific activitiesβ€”often in colors and styles not available from Apple.

Universal Compatibility: All Apple Watch models use the same standardized band attachment system, ensuring third-party bands connect and release identically to official Apple bands.

Selection Considerations:

Size Matching: Ensure proper case size compatibilityβ€”41mm bands fit 41mm watches, 45mm bands fit 45mm watches. Incorrect sizing prevents proper attachment.

Quality Assessment: Read user reviews and purchase from reputable manufacturers to ensure adequate build quality, secure attachment, and comfortable wear.

Material Considerations: Consider skin sensitivity when selecting materials, particularly with metal alloys or synthetic materials that may cause irritation.

Popular Third-Party Options:

Sport Bands: Silicone alternatives matching Apple's sport band functionality at reduced cost Leather Straps: Professional appearance options for business and formal settings
Metal Bracelets: Premium aesthetic upgrade with various finishes and link styles Specialty Bands: Activity-specific designs for fitness, swimming, or outdoor use

Bottom Line: Third-party Apple Watch Series 9 bands offer excellent value for customization and style variety, allowing users to personalize their device affordably while maintaining the same ease of use and secure attachment as official Apple bands.

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The Apple Watch Series 9 excels at fitness tracking and running for recreational athletes and general fitness enthusiasts, offering comprehensive health monitoring with heart rate tracking, GPS capabilities, and extensive workout variety.

Fitness Tracking Strengths:

Comprehensive Monitoring:

  • Accurate heart rate tracking during various activities
  • GPS-enabled outdoor workout tracking
  • Automatic workout detection for common exercises
  • Activity ring motivation system for daily movement goals
  • Seamless integration with Apple Health and third-party fitness applications

Running Capabilities:

  • Real-time pace and distance tracking
  • Route mapping and workout summaries
  • Heart rate zone monitoring during activities
  • Split time tracking for interval training

Ideal User Profiles:

Well-Suited For:

  • Recreational runners (3-10 mile distances)
  • General fitness enthusiasts with varied workout routines
  • Users wanting comprehensive health tracking beyond exercise
  • Apple ecosystem users seeking seamless device integration

Limitations for Advanced Athletes:

Performance Constraints:

  • No manual lap marking during track workouts
  • Limited advanced running metrics compared to dedicated sports watches
  • GPS lock acquisition time before workout start
  • 18-hour battery life may require charging during extended training sessions

GPS Performance: Built-in GPS provides adequate accuracy for most running activities but lacks the precision of dedicated sports devices or Apple Watch Ultra's dual-frequency system.

Alternative Considerations: Serious marathon trainers, competitive athletes, or users requiring multi-day battery life should consider specialized sports watches or the Apple Watch Ultra for enhanced performance analytics.

Bottom Line: The Apple Watch Series 9 delivers excellent fitness tracking for recreational runners and general fitness users, combining solid exercise monitoring with full smartwatch functionality, though dedicated sports watches may better serve competitive athletes.

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The Apple Watch Series 10 offers meaningful improvements over the Series 9, though both provide excellent smartwatch functionality. Understanding the key differences helps determine which model best fits your needs and budget.

Primary Series 10 Advantages:

Enhanced Charging Performance: Series 10 achieves 0-80% battery in approximately 30 minutes compared to Series 9's 45-minute charging time, providing greater convenience for users with irregular charging habits.

Improved Display: Larger, brighter screen with enhanced visibility in bright conditions and increased real estate for apps, complications, and interface elements.

Updated Processor: The S10 chip delivers improved performance and enables enhanced features like faster on-device Siri processing.

Design Evolution: Refined case dimensions (42mm/46mm vs 41mm/45mm) with thinner profile for improved comfort and aesthetics.

Shared Core Capabilities: Both models include identical health monitoring (heart rate, ECG, sleep tracking), GPS functionality, cellular options, water resistance, app ecosystem access, and daily usability features.

Value Considerations:

Choose Series 10 for:

  • Latest technology and longest software support lifecycle
  • Significantly faster charging requirements
  • Premium display experience
  • Budget flexibility for higher-tier features

Choose Series 9 for:

  • Cost-conscious purchasing (typically -150 savings)
  • Satisfaction with proven performance capabilities
  • Adequate charging speed for current usage patterns
  • Shorter planned device lifecycle

Bottom Line: While Series 10 provides genuine improvements, Series 9 remains a highly capable smartwatch offering excellent value. The decision depends on individual priorities regarding latest features versus cost savings.

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