Whoop Band 4.0Key features of the Whoop Band 4. 0 : Advanced health & fitness tracking Tracks heart rate, HRV, respiratory rate, skin temperature, and blood oxygen (SpO). It provides continuous 24 7 biometric monitoring using optical sensors. Strain, recovery & sleep system Focuses on three core metrics: strain (physical exertion), recovery (readiness to perform), and sleep (quality and duration with personalized recommendations). Sleep coaching & smart alarm
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