Ultrahuman/ZDNET Follow ZDNET: Add us as a preferred source on Google. ZDNET’s key takeaways  Ultrahuman unveiled its Ultrahuman Ring Pro.  The smart ring offers 15 days of battery life.  Due to patent disputes, it isn’t available to buy in the US.  Ultrahuman’s next-generation smart ring could stay on your finger for over two weeks with a recharge. The smart ring maker unveiled the Ultrahuman Ring Pro on Friday, and the newest smart ring offers significant upgrades over th...