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The Halo Sense Ring 4 is a lightweight smart ring that tracks sleep stages, overnight heart rate and HRV, stress, cycle temperature trends and daily activity, with no monthly subscription. It stands out from rivals like Oura, which charges a recurring membership, by keeping all insights in the free Halo app. Battery life of up to 5 days and 100 m water resistance make it a wear-and-forget tracker. It suits people who want sleep and recovery data without a subscription, though its overnight-only heart rate tracking limits it for workout-focused users.
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Halo Sense Ring 4 is a lightweight smart ring that tracks sleep, heart rate, HRV, stress, cycle and daily activity. It turns the data into simple insights in the free Halo app. There is no monthly subscription.
The ring records sleep stages and gives a morning sleep score. It tracks heart rate and HRV overnight, and shows stress and recovery signals throughout the day. For daily activity, it counts steps, workouts, active minutes and calories. Cycle tracking uses overnight temperature trends.
Battery life is up to 5 days. The ring is waterproof to 100 m.
