Smartwatches & Trackers Ultrahuman

Refurbished reasons: The original packaging is not in perfect condition. The item has been unsealed due to testing.Introducing the Ultrahuman Ring Air, the ultra-comfortable fitness wearable. With its notch-free, ultra-thin design and smooth inner shell, the Air Ring offers unparalleled comfort day and night. It features sleep tracking for a comfortable and unobtrusive experience. Weighing only 2.4 grams, it is the lightest smart ring on the market. Combining minimalism with precise performance, this sleek device allows users to effortlessly monitor sleep, movement, heart rate, heart rate variability and skin temperature.The sleep index was derived to help you understand the different sleep