Thank you for viewing this product. This is a replacement filter (1 piece) for the "Uruoi Cube" humidifier, which requires no electricity. Simply insert this filter into the main unit (sold separately) and pour water. How about an easy and eco-friendly humidifier? Since it doesn't use electricity, it can be used safely in homes with babies and pets. *The main unit is also for sale. If you would like to purchase them together, please comment before purchasing. (2 filters remaining. As of R7 5/18) Also, If you would like to use them in multiple rooms, please write in the comment section that you would like to buy them in bulk. I will create a dedicated page for you. We offer a bulk discount.