Whoop 4.0

The WHOOP 4.0 is a screenless, 24/7 biometric fitness and recovery wearable that tracks heart rate, heart rate variability (HRV), skin temperature, and blood oxygen (SpO2). It operates on a membership model and pairs with the WHOOP App to deliver daily strain, sleep, and recovery scores. Key Features • Biometric Sensors: Includes an optical heart rate sensor, a pulse oximeter for SpO2, and a skin temperature sensor. • Design: 33% smaller than the previous WHOOP 3.0, featuring a screenless, waterproof build. • Battery Life: Lasts about 5 days on a single charge and uses a slide-on, waterproof external battery pack. • Haptic Alarms: A silent, vibrating alarm built into the strap can wake you up at your optimal recovery time. • Any-Wear Technology: Can be slipped into specialized WHOOP Body apparel for placement on the torso, waist, or calf. What It Tracks • Strain: Measures your daily cardiovascular and muscular load on a 0-21 scale. • Recovery: Evaluates your readiness to perform using HRV, resting heart rate, and sleep metrics. • Sleep: Analyzes sleep stages, disturbances, and efficiency to generate a nightly sleep score.