Chip: S8 SiP with 64‑bit dual-core processor 2-core Neural Engine

Storage: 32GB 

Sensor: Second-generation optical heart sensor Compass Always-on altimeter High-g accelerometer High dynamic range gyroscope Ambient light sensor

Health & Wellness: Heart Rate app High and low heart rate notifications¹ Irregular rhythm notifications Medications app Mindfulness app Noise app Sleep app including sleep stages

Battery Life: All-day battery life, up to 18 hours of normal use Built-in rechargeable lithium-ion battery Up to 80% charge in about 1.5 hours

Water resistance: Water resistance 50m (swimproof)