Display: Retina LTPO OLED display

Processor: Dual-core S5 system on chip

Battery: Up to 18 hours of battery life

Connectivity: Wi-Fi, Bluetooth, Cellular (LTE), GPS, NFC

Water resistance: 50 meters under ISO standard 22810:2010

Sensors: Accelerometer, altimeter, ambient light sensor, electrocardiogram (ECG), gyroscope, heart rate sensor, compass

Features: Fitness tracking, sleep tracking, notifications, app support, Apple Pay, Always-On display