iSwimband is a water-detecting bluetooth sensor that sends alerts to your phone if your child is in the water. For the littlest ones, it can work as a bracelet and be configured to send out an alarm if there’s any contact with water. The sensor and headbands are currently available for a cool $100. For bigger kids it can be set to only freak out if contact is severe and prolonged enough to be troublinghence the wonderful third-eye look.”]
Source: https://gizmodo.com/a-smart-headband-that-keeps-your-kids-safe-and-forever-1611648803