Apple Launches Watch Series 12 and Ultra 4 with Advanced Health Sensing System

Apple opened preorders today for its new Watch Series 12 and Ultra 4, unveiling a redesigned Health Sensing System powered by the S11 chip. The system features ring‑arranged photodiodes, a larger electrode surface for better skin contact, and larger, power‑efficient green LEDs that capture heart data every five seconds. These upgrades enable higher‑frequency heart rate and heart‑rate‑variability measurements than previous models. Users can now view real‑time heart rate on a new watch‑face complication. Apple claims the combination delivers the most accurate heart‑rate sensing available in a wearable. The preorders are available through Apple’s fall event website, allowing consumers to secure the new watches immediately.