This is a GEX Pure Crystal dog water fountain. It holds about 1.5 liters of water. I used it for about a year and a half, but I no longer need it, so I'm selling it. 【The internal filter is not included】so please purchase one yourself. You should be able to buy one at a pet store or home center. I used it for two dachshunds. Because it's a circulating type, it was good for increasing my dogs' water intake. I cleaned it thoroughly, but it is a used item, so please understand... Would anyone like it? Please feel free to comment if you have any questions or would like to negotiate the price.