https://www.whoop.com/thelocker/whoop-4-0-vs-3-0-whats-new/
Price: Free with $30 membership
Description
WEAR IT ANY-WEAR Comfortable enough to wear non-stop thanks to new, durable SuperKnit bands, but flexibly designed to be worn off your wrist in new WHOOP Body apparel.
WAKE UP AT THE OPTIMAL TIME Set a haptic alarm that gently vibrates to wake you at the optimal time based on your sleep needs and cycles.
MONITOR YOUR HEALTH A robust sensor suite allows you to monitor your key vital signs: Blood oxygen levels, skin temperature readings, and heart rate metrics.
GET MORE ACCURATE DATA 5 LEDs and 4 photodiodes capture your data more often than most wearables, providing best-in-class accuracy validated in lab studies and with third-party testing.
TRACK METRICS 24/7 Wirelessly charge your WHOOP with a waterproof* battery pack and capture data continuously—even while in the shower or washing dishes.
Whoop App
SLEEP BETTER WHOOP monitors your sleep cycles, debt, performance, and quality, to help you know how much sleep you need every night.
TRAIN SMARTER WHOOP measures and accumulates your training activities and daily effort with a Strain score that helps you understand when to rest or push.
RECOVER FASTER WHOOP analyzes your key metrics like HRV and resting heart rate to determine a daily recovery score, and shows you how specific lifestyle and training behaviors affect Recovery.
NEW! FEEL HEALTHIER WHOOP now measures your blood oxygen levels, skin temperature, heart rate, and more, so you can see when you’re making progress, or when something’s off your baseline.
COACHING The WHOOP app delivers personalized insights and actionalble feedback based on your unique data, behaviors, and goals.