On one occasion, however, my unit got a bit warm, irritating my wrist and leaving a red mark on my skin. That said, the Whoop 4.0 is lightweight and generally comfortable to wear 24/7, even when sleeping. On one occasion, my unit got a bit warm, irritating my wrist and leaving a red mark on my skin Its sensor module is just as wide and tall as the previous version, but it's a bit shorter Whoop says the 4.0 is a third smaller overall. ![]() The Whoop 4.0 retains the design of the previous model and measures 1.7 by 1.1 by 0.4 inches (LWH) including the clasp. But given the issues we experienced in testing, we recommend you look to more affordable and feature-rich alternatives, such as the Editors' Choice award-winning Fitbit Charge 5 ($179.95). And although the fitness tracker still has an awkward, screenless design, it's smaller than its predecessor, offers haptic alarms to silently wake you up, and comes with a waterproof battery pack that can charge the tracker while you wear it. Namely, it can track your blood oxygen saturation (SpO2) level and body temperature, both of which can reveal early warning signs of COVID-19. That’s disappointing, because the new version offers some promising upgrades over the previous model. ![]() We liked the Whoop 3.0 when we reviewed it last year, but the Whoop 4.0 ($288 per year) takes an unexpected step back: We tested three separate units, and they each gave us inflated heart rate readings and falsely detected activities. How to Set Up Two-Factor Authentication. ![]()
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