{
  "schema_version": "2.0",
  "product": {
    "brand": "Apple",
    "category": "smartwatch",
    "family": "Apple Watch",
    "model": "Apple Watch Series 4",
    "model_slug": "apple-watch-series-4",
    "model_year": 2018,
    "year_introduced": 2018
  },
  "source": {
    "source_type": "manufacturer",
    "source_url": "https://support.apple.com/en-sg/111984",
    "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html",
    "source_title": "Apple Watch Series 4 - Technical Specifications - Apple Support (SG)",
    "publisher": "Apple Support",
    "published_at": null,
    "checked_at": "2026-11-11",
    "verification_status": "content_verified",
    "verification_notes": "Official Apple technical-specification HTML archived with a SHA-256 sidecar; page identity matched 'Apple Watch Series 4'; 7 specification sections extracted. Model identity and year-introduced evidence is retained separately from Apple's identification page at https://support.apple.com/en-ie/108056.",
    "notes": [
      "Technical specification sections are transcribed from the archived model-specific Apple Support page; every section retains its own source URL and archive path.",
      "Model identity/year evidence is separately sourced from https://support.apple.com/en-ie/108056, archived at apple_watch_extraction/technical_specs_html/apple-watch-model-identification.html.",
      "This is an archival-first extraction; normalized values have not been inferred from the section text."
    ]
  },
  "extraction": {
    "method": "section_preserving",
    "normalization_status": "archival_first_pass",
    "note": "Official Apple technical-specification source text is retained by section. Existing product identity fields are preserved; no normalized specifications have been inferred.",
    "extracted_at": "2026-11-11",
    "reviewed_at": null
  },
  "sections": [
    {
      "heading": "Model identification",
      "source_text": "Apple Watch Series 4. Year introduced: 2018.",
      "source_url": "https://support.apple.com/en-ie/108056",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-model-identification.html"
    },
    {
      "heading": "Finishes",
      "source_text": "GPS + Cellular\nStainless Steel\nSilver\nSpace Black (DLC)\nGold (PVD)\nAluminum\nSilver\nSpace Gray\nGold\nGPS\nAluminum\nSilver\nSpace Gray\nGold\nApple Watch Nike+ available in silver and space gray aluminum.\nApple Watch Hermès available in polished stainless steel.",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    },
    {
      "heading": "Features",
      "source_text": "GPS, GLONASS, Galileo, and QZSS\nBarometric altimeter\nWater resistant\n50 meters\n1\nElectrical heart sensor\nOptical heart sensor\nImproved accelerometer\nup to 32 g-forces\nImproved gyroscope\nAmbient light sensor\nSpeaker\nMicrophone\nApple Pay\nGymKit\nCapacity 16GB\nCeramic and sapphire crystal back",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    },
    {
      "heading": "Display",
      "source_text": "44mm\n368 by 448 pixels\n977 sq mm display area\n40mm\n324 by 394 pixels\n759 sq mm display area\nLTPO OLED Retina display with Force Touch\n1000 nits brightness",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    },
    {
      "heading": "Chip",
      "source_text": "S4 with 64-bit dual-core processor\nUp to 2x faster processor\nW3\nApple wireless chip",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    },
    {
      "heading": "Connectivity",
      "source_text": "LTE and UMTS\n2\nGPS + Cellular models\nWi-Fi\n802.11b/g/n 2.4GHz\nBluetooth 5.0",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    },
    {
      "heading": "Power",
      "source_text": "Built-in rechargeable lithium-ion battery\nUp to 18 hours\n3\nMagnetic charging cable\nUSB power adapter",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    },
    {
      "heading": "Case Size",
      "source_text": "Stainless Steel - 40mm\nHeight: 40mm\nWidth: 34mm\nDepth: 10.7mm\nCase Weight: 39.8g\nStainless Steel - 44mm\nHeight: 44mm\nWidth: 38mm\nDepth: 10.7mm\nCase Weight: 47.9g\nAluminum - 40mm\nHeight: 40mm\nWidth: 34mm\nDepth: 10.7mm\nCase Weight: 30.1g\nAluminum - 44mm\nHeight: 44mm\nWidth: 38mm\nDepth: 10.7mm\nCase Weight: 36.7g",
      "source_url": "https://support.apple.com/en-sg/111984",
      "source_file": "apple_watch_extraction/technical_specs_html/apple-watch-series-4-tech-specs.html"
    }
  ],
  "record_notes": [
    "First-pass historical Apple Watch record based on an official Apple Support product-specific page.",
    "Direct Tech Specs article URL is not yet independently established for this historical model.",
    "Technical specification sections now come from the archived model-specific Apple Support page; model/year identity is separately sourced from Apple's identification page."
  ]
}