Developing the GreyBand: a sleek and fashionable wearable breathalyzer with Bluetooth capabilities for an associated smartphone app. On the app, set your desired limit of intoxication. When you blow into the device, the LED will either shine a green light: continue drinking responsibly; a yellow light: slow down, you are approaching your limit; or a red light: stop, seek help, drink water, here is a button to call an Uber. And if anyone is overly intoxicated, all of their friends are notified.