Take care of your health and fitness with the Colmi R02 smart ring. The ring monitors heart rate, sleep and blood oxygen saturation and also counts steps and calories burnt. It offers 21 sports modes and has IP68 water resistance. With the special QRing app, you have convenient access to all the information collected. The smart ring also impresses with its lightweight design, an operating time of up to 6 days on a single charge and its stylish, elegant design.