Reddit reviews Water Powered Clock in Bottle Shape, Orange No Batteries Required Just add water
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No batteries requiredTinted, transparent body displays the electrode plates that harness power from the waterEasy to remove pop-off cap for refilling waterSize: 2 1/4 x 8 x 2 1/4 Inches
Looks like this:
https://www.amazon.com/Powered-Bottle-Orange-Batteries-Required/dp/B003BVRPOE