Our hydrogen-rich water cup provides water that is loaded with healthy hydrogen to maintain health and beauty. It eliminates harmful free radicals, prevents cell oxidation, fights diseases, improves metabolism, slows down aging, and enhances skin quality. Drinking one and a half liters of our hydrogen-rich water is equivalent to antioxidants found in hundreds of fruits and vegetables. Our cup includes these features: A five to ten minute time mode and battery display screen, producing up to 3000-5000ppb hydrogen concentration. 100% safe water electrolysis technology with a multilayer Platinum Plating Electrode. Made from high-quality Korean LG imported PC material that is BPA-free and food grade. ORP up to -300mV -700mV. Easy USB Type-C charging and hydrogen absorption device. Recommended maintenance is cleaning with citric acid every two to four weeks. NOTE: Please use professional hydrogen water testing reagents for detection instead of hydrogen pens, as the maximum testing limit of all hydrogen gas testing pens currently on the market is 1500ppb. If you need to test high-concentration hydrogen-rich water of our bottle, please use a professional hydrogen-rich water titrant for testing! Please activate membrane before use: Fill the bottle with 5/6 of drinking water,soak for about 3 hours, after 3 hours start the hydrogen production twice in 10 minutes mode (equivalent to hydrogen production for 20 minutes), then do not open the lid, put it for 810 hours, then the membrane will be activated successfully. (It is better to activate membranes with a 350ml mineral water bottle.)