From a Yanko Design online review:

This is the Barsys Coaster, a smart coaster with a mini weighing-machine and an AI inside it that coaches you through the fine cocktail-mixing process. The coaster works with the Barsys app, which lets you select a recipe, while the coaster itself sits on a table with an empty glass above it. The app tells you how to build your cocktail, by telling you what to pour into your glass, while the coaster and its weight-sensor lets you know when to stop pouring. 

The incredibly precise weight-sensor within the coaster can know exactly when you’ve poured the right amount of gin, or vodka, or orange juice, while the app itself then tells you to stop pouring and proceed to the next step. The result? Precisely crafted cocktails courtesy an AI bartender and your passion for drinking fine cocktails from the comfort of your own house as Netflix cues the next episode of whatever it is you’re watching!

To read more: https://www.yankodesign.com/2019/11/08/this-coaster-has-an-ai-bartender-that-guides-you-through-the-cocktail-making-process/