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Talk about an appealing slogan for an era of pandemics, disputed elections, and social-media bickering: Sensate 2 boasts “instant calm for an anxious mind.” The wearable device looks like a rounded pebble that users place on their chest. It then creates low-frequency sounds that the company claims tone the vagus nerve, a long, complex nerve that can counter the body’s “fight or flight response,” to put you into a state of relaxation and potentially prepped for a better night’s sleep.

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