Bluetooth Fitness Tracker Smart Ring

This smart ring tracks sleep patterns, heart rate variability, blood oxygen levels, and daily activity. It has an IP68 waterproof rating for rain and swimming. The battery lasts 7-9 days with a magnetic charging mechanism. The price drops from $39.99 to $21.99 when you apply the code "458IP7LO" at checkout. Shipping is free for Prime members or on orders over $35.