This is just a glass bottle with magnesium balls inside. You need to pour HOT water in and let it settle. Here's how it works. If you are looking for rechargeable/electric hydrogen cylinders, this is NOT the product. It looks almost the same and the price is the same. The title of the listing also says "Hydrogen". Be careful and pay attention to what you are buying when looking at them! Now I have to return it.
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