The Vive Wristband is a conceptual wearable intended to help people avoid dangerous situations when drunk. It packs sensors that measure your blood alcohol content and check for dehydration. In addition to seeing if you're too drunk or in need of water, the Vive Wristband also lets your friends track your location.
The Vive Wristband uses WiFi and GPS to tell your friends where you are, with said information being displayed on an accompanying app. The designers behind the project imagine it being used to keep people together (and safe) at raves, parties and concerts. The product is still a concept, but it did win Best Product Concept at the Microsoft Research Faculty Summit Design Expo 2014. You can check out the video to see Vive in action.