In fact, the principle is quite simple. There are usually sensors in the cup that can record your water intake. And it often syncs with a companion app via Bluetooth. In this way, you can see your daily water intake progress on your mobile phone and set goals. Some smart tumblers sense motion or weight to detect how much water you’ve consumed. And they will send you reminders by LED or LCD indicators, or even send messages on your phone in case you forget to drink water.
So, in simple terms, a smart water cup is like a portable little “drinking water coach” that helps you develop a regular drinking habit.