The Apple Watch Series 8 (2022) features a durable 41mm or 45mm design with an Always-On Retina display, the S8 SiP chip, and advanced health sensors including temperature sensing for cycle tracking, ECG, and blood oxygen monitoring. It introduced Crash Detection, international roaming, and 18-hour battery life. 

Key Features and Specifications:

• Design & Display: Large, edge-to-edge Always-On LTPO OLED display (up to 1000 nits) with a strong, crack-resistant front crystal and IP6X dust resistance.
• Health Sensors: Features a new skin temperature sensor for improved sleep and cycle tracking, a third-gen optical heart sensor, electrical heart sensor (ECG), and blood oxygen sensor.
• Safety: Crash Detection (using high-g accelerometer and gyroscopes), Fall Detection, and Emergency SOS.
• Performance: Powered by the S8 SiP dual-core processor, with 32GB storage.
• Battery & Charging: Up to 18 hours of "all-day" battery life, with fast charging capabilities (0–80% in about 45 minutes).
• Connectivity: Available in GPS and GPS + Cellular models, featuring Bluetooth 5.3 and Wi-Fi.
• Durability: Water-resistant up to 50 meters (swim-proof). 

Models & Finishes:

• Aluminum: Available in Starlight, Midnight, Silver, and (PRODUCT)RED.
• Stainless Steel: Available in Silver, Graphite, and Gold. 

The Series 8 focuses on, and excels at, comprehensive health monitoring and safety, making it a robust,, and iterative upgrade over the Series 7.