Yes, we are talking about a smart strap for the Apple Watch and not a common quantizer band. The Aura company presented during CES 2019, a smart strap for the Apple Watch that is responsible for measure weight, water, fat and muscle through a series of sensors built into the strap.
This strap finally did not see the light in 2019, as the company had assured, but it will do so in 2020, specifically in March. If you want to be one of the first to receive this smart strap, Aura already offers us the possibility of reserving it, at a price of $ 99.
Aura claims the strap system uses bioimpedance to analyze the upper body, tracking the performance of the lungs and changes in respiration by comparing that information with the pulse data.
The strap is able to assess the risk of heart failure and notify the wearer, a feature that is also available natively on the Apple Watch from Series 4. However, measuring body composition and hydration is something the Apple Watch cannot do at the moment.
This smart strap manufactured by Aura is available in four colors: black, green, red and gray, it is compatible with all Apple Watch models and according to the images it is made of nylon (not specified). It has a battery (CR1620) with an approximate duration of 6 months and transfers the results to the Apple Watch "through an ultrasound interface". It is compatible with the Health application in addition to being waterproof (IP 68).
If you want to reserve the strap, you can already do it through this link. Aura also offers us a quantifying bracelet with the same functions of this strap for the Apple Watch, in addition to the basic ones of this type of product, for $ 179.