Meet the OxiWear: smart earbuds that can monitor oxygen level and other vitals and provide you with haptic feedback. You will be able to set safe thresholds for alerts. The companion app provides you with live updates on your vitals and shows your past data. You can also add emergency contacts.
The OxiWear earbuds are waterproof and sweat-proof. They are easily customizable too. You can find out more about this project here.