Smart Rings are wearable technological devices designed to be beautiful, elegant, practical and functional. These sleek water-resistant rings are more than just fitness trackers, they can also monitor your sleep with infrared sensors, measure heart rate and stress levels and send the information to another device (Smartphone or Tablet). They are usually compatible with iOS or Android via a downloaded app. Many use NFC technologies usually applied to unlocking mobile phones and car doors or making payments. Pricewise they’re very accessible with a decent model costing less than a hundred euros.