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Originally designed as a sleep tracker, ŌURA Ring has evolved its innovative design over the years to monitor a broader scope of health and wellness arenas to include dedicated fitness features like heart rate monitoring, along with overnight blood oxygen sensing, stress detection, period prediction functionality, and so much more. Right now, the brand is offering 19 percent off its Horizon rings in select colors for Amazon Prime Day.

If you’re unfamiliar with the ŌURA rings’ technology, there are a few key factors that make the leading smart ring more appealing than wrist wearables. Unlike other wrist wearables like the Fitbit and Apple Watch, the ŌURA Ring is worn on your finger, offering a more sleek and discreet profile. More importantly, rings also tend to fit better, yielding more accurate health readings. The ring’s form factor was chosen because the finger provides a stronger heart rate signal than any other place on the body; it’s the only “research-validated wearable on the market that directly measures the arteries in your fingers (just like doctors do),” Karina Kogan, former Chief Marketing Officer at ŌURA tells The Daily Beast. If you’ve been looking to ditch your wrist tracker for something more stylish, ŌURA’s Amazon Prime Day deal has you covered.