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Apple Watch Series 4
Released:2018•OS:watchOS (starting with version 5, upgradable to later releases)
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Specifications
Processor
Apple S4 64-bit dual-core SiP
Display
40mm: 324×394 pixels (1.57" approx) / 44mm: 368×448 pixels (1.78" approx) LTPO OLED Retina, ~1000 nits brightness
Battery
Battery Life:Up to ~18 hours (typical usage)
Charging:Magnetic charging cable (included)
Sensors
Optical heart‐rate sensor, Electrical heart sensor (ECG capable), Accelerometer (up to 32 g), Gyroscope, Barometric altimeter, Ambient light sensor
Water Resistance
50 meters (ISO 22810:2010) – suitable for shallow-water activities
Connectivity
Wi-Fi 802.11b/g/n (2.4GHz), Bluetooth 5.0, GPS/GLONASS/Galileo/QZSS, NFC (Apple Pay)
Physical Aspects
Design:Case sizes 40mm or 44mm, Aluminium or Stainless Steel finishes; Digital Crown with haptic feedback; Ceramic and sapphire-crystal back on some models
Weight:40mm Al: ~30.1g; 44mm Al: ~36.7g; 40mm Steel: ~39.8g; 44mm Steel: ~47.9g
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