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
Second-generation Retina OLED display, 1000 nits
Ion-X glass display
GPS model
S3 SiP with dual-core processor; W2 wireless chip
Digital Crown
Optical heart sensor
High and low heart rate notifications and irregular heart rhythm notification1
Emergency SOS2
Water resistant 50 meters3
Wi-Fi and Bluetooth 4.2
GPS/GNSS and barometric altimeter
Built-in speaker and mic
8GB capacity