Elevate your health and performance with the Ultrahuman Ring AIR in Bionic Gold. Try before you buy in-store, Or download the AI Ultrahuman app to find your ring size Please Note: Once the box is opened, the ring cannot be returned. Gain valuable insights to enhance your fitness, recovery, and well-being. This sophisticated wearable is a game-changer in optimal wellness. The ring tracks key metrics like heart rate variability (HRV), sleep quality, body temperature, and physical activity.  Weighing just 2.4 grams, the Ultrahuman Ring is incredibly light and comfortable  Crafted with durable titanium, making it the perfect blend of style and strength for everyday wear. Enjoy up to 6 days of battery life on a single charge.  Water-resistant, allowing for use during intense workouts or swimming. Sensors included: Infrared Photoplethysmography (PPG) sensor, Non-contact medical-grade skin temperature sensor, 6-axis motion sensors, Red LEDs (heart rate monitoring and oxygen saturation), Green LEDs (heart rate monitoring), Infrared LEDs (heart rate monitoring) The outer shell is made from fighter jet grade Titanium reinforced with Tungsten Carbide Carbon coating, making it resistant to everyday wear and tear The inners of the ring is coated with medical-grade hypoallergenic epoxy resin, making it comfortable to wear at all times Please Note: Once the box is opened, the ring cannot be returned.