Oura
Silver Ring 4 Smart First Sizing Kit Sleep Tracking Wearable Heart Rate Fitness Tracker Up to 8 Days of Battery Life

$471
From Amazon UK
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Product Details

Compact and intelligent design for comfortable everyday wear Advanced health monitoring capabilities, including heart rate, sleep patterns, and activity tracking Long battery life with convenient wireless charging Seamless smartphone app integration for detailed health and activity analytics Available in multiple finishes and sizes for personalized style

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