I bought this water fountain from Amazon. The price is higher than other water fountains but I have to say this is the best water fountains I've ever used. It's silent. I can barely hear the sound of flowing water. This version has two modes. The high-flux mode allows cat hairs to be pushed out from the surface of the water so cats wouldn't accidentally eat their hairs while drinking. It also has reminders to tell me when the water is below the lowest point, when the battery is almost out, and when is the time to change the filter. Most importantly, this water fountain makes my cat love drinking! He now drinks a lot of water each day. I'm pretty happy about this change and would like to recommend this water fountain to everyone who has pets.