
Mark One's Pryme Vessyl is an iPhone-connected cup that's designed to track your daily liquid intake, making sure you're at your optimal hydration level. According to Mark One, hitting an ideal hydration level can increase your energy level and improve your mental balance.
Paired with an accompanying app, Pryme Vessyl calculates a user's hydration needs based on height, weight, activity level, and other factors, making sure that intake level is met by measuring each sip of water or liquid through accelerometers in the cup itself. Hydration needs change from day to day, so the goal of the Pryme Vessyl is to make sure users are getting enough hydration as activity level shifts.

The idea is to drink all of your liquids -- coffee, tea, water, juice -- out of the Pryme Vessyl to get an overall picture of liquid intake and track any deficits.
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Article Link: Review: Pryme Vessyl is an iPhone-Connected Smart Cup That Isn't Smart Enough