Originally released September 2018
S4 with 64-bit dual-core processor (Up to 2x faster than S3 processor)
Electrical heart sensor (ECG app)
LTPO OLED Retina display with Force Touch (1000 nits brightness)
Wi-Fi (802.11b/g/n 2.4GHz)
All ceramic and sapphire crystal back
What’s in the Box
Refurbished Apple Watch Series 4
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.
Dimensions
Case Weight: 30.1g
Chip
S4 with 64-bit dual-core processor (Up to 2x faster than S3 processor)
W3 Apple wireless chip
Features
GPS, GLONASS, Galileo, and QZSS
Electrical heart sensor (ECG app)
Second-generation optical heart sensor
Improved accelerometer up to 32 g-forces
Digital Crown with haptic feedback
50% Louder speaker than S3
All ceramic and sapphire crystal back
Wi-Fi (802.11b/g/n 2.4GHz)
Display
LTPO OLED Retina display with Force Touch (1000 nits brightness)
Sapphire crystal glass (stainless steel cases)
Ion-X strengthened glass (aluminum cases)
Power and Battery
Built-in rechargeable lithium-ion battery
