Display

Always-On Retina LTPO OLED display with Force Touch

1000 nits brightness

Over 30% larger display than Series 3

Chip

S5 SiP with 64-bit dual-core processor

W3 Wireless Chip

Battery

Built-in rechargeable lithium-ion battery

Up to 18 hours

Features

GPS/GNSS

Compass

Barometric altimeter

Water resistant – 50 meters

Electrical heart sensor

Second-generation optical heart sensor

Accelerometer

Gyroscope

Summary

Always-On Retina display with Force Touch, Built-in Compass, Barometric altimeter, Optical heart sensor, Electrical heart sensor, Accelerometer, Gyroscope, Improved ambient light sensor, Digital Crown with haptic feedback and a Speaker

Compatibility

iPhone 6s or later and iOS 13 compatibility