Space Gray aluminum case

LTE and UMTS

Built-in GPS, GLONASS, Galileo, and QZSS

S4 with 64-bit dual-core processor

W3 Apple wireless chip

Barometric altimeter

Capacity 16GB

Optical heart sensor

Electrical heart sensor

Improved accelerometer up to 32 g‑forces

Improved gyroscope

Ambient light sensor

LTPO OLED Retina display with Force Touch (1000 nits)

Digital Crown with haptic feedback

Louder speaker

Ion-X strengthened glass

Sapphire crystal and ceramic back

Wi-Fi (802.11b/g/n 2.4GHz)

Bluetooth 5.0

Built-in rechargeable lithium-ion battery

Approximately 18 hours of battery life2

Water resistant 50 meters3

watchOS 5