Description
Overview
- Originally released September 2018
- S4 with 64-bit dual-core processor (Up to 2x faster than S3 processor)
- Electrical heart sensor (ECG app)
- Water-resistant to 50 meters1
- LTPO OLED Retina display with Force Touch (1000 nits brightness)
- Wi-Fi (802.11b/g/n 2.4GHz)
- Bluetooth 5.0
- Optical heart sensor
- Improved accelerometer
- Improved Gyroscope
- Ambient light sensor
- Capacity 16GB2
- All ceramic and sapphire crystal back
Features
- GPS, GLONASS, Galileo, and QZSS
- Barometric altimeter
- Water-resistant to 50 meters1
- Electrical heart sensor (ECG app)
- The second-generation optical heart sensor
- Fall detection
- Improved accelerometer up to 32 g-forces
- Improved gyroscope
- Ambient light sensor
- Digital Crown with haptic feedback
- 50% Louder speaker than S3
- Capacity 16GB2
- All ceramic and sapphire crystal back
- Wi-Fi (802.11b/g/n 2.4GHz)
- Bluetooth 5.0
Display
- LTPO OLED Retina display with Force Touch (1000 nits brightness)
- Sapphire crystal glass (stainless steel cases)
- Ion-X strengthened glass (aluminum cases)
- 324 by 394 pixels (40mm)
- 368 by 448 pixels (44mm)
Power and Battery
- Built-in rechargeable lithium-ion battery
- Up to 18 hours5
- Magnetic charging cable
- USB power adapter
What’s in the Box
- Refurbished Apple Watch Series 4
- Magnetic charging cable
- USB power adapter
System Requirements
- Requires an iPhone 6s or later with iOS 13 or later
- Some features may not be available for all countries or regions.
