Dear friends, this is what I summarized from Japanese sellers. Enjoy it and wish you good health!
1. Charge with an empty cup for three hours before use (USB can also be used, or put the USB on the mobile phone charging head) until the green light on the base turns on.
2. Now you can start using it. You can put mineral water or water from a water dispenser, as long as it is filtered water. If you want it to taste good, you can put a little salt or lemon juice. Do not use purified water (purified water has no minerals)
3. Cover the lid and press the switch below two or three times. I understand that the blue light will light up. Pour it out after three minutes and continue again. Continue, one minute or three minutes is fine. Three minutes will produce nearly 1000ppb of hydrogen water. One minute is also good.
4. Remember to clean the cup regularly with white vinegar (I do this myself).