The Ultrahuman Ring AIR is the perfect sleep tracker ring. In addition to insights into all sleep stages - REM sleep, deep sleep, light sleep and wakefulness - you get actionable steps to improve your sleep so you're ready for the day. The 'Movement Index' keeps you moving throughout the day to optimise your glucose metabolism and increase your energy expenditure without exercise. Carefully designed for comfort, this sleek device combines a minimal form factor with precise performance. It allows the user to effortlessly monitor key health indicators such as sleep, exercise, heart rate (HR), heart rate variability (HRV) and skin temperature.