The sensor stick is powered by two coin cell batteries and tracks how much water is in the bottle. When you drink out of the bottle it senses how much water you have drunk. It uses bluetooth to transfer the info to the app on your phone so you can see how many ounces or milliliters you have had to drink. The sensor stick also knows when you remove the cap from the bottle so it will not send false data when you empty or refill your bottle.
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