Features: Dual Power Supply Methods - Powered by wall charger/3*AA battery(Battery is not included). Environment Material - Made of food-grade ABS material, this automatic water bowl is BPA-free, non-toxic and odorless which can be used safely and securely. Biological Induction - Water will automatically gush when the cat approaches, and automatically stop water when it leaves. Low Noise - 5V silent low-voltage water pump operates with ultra-low noise so that no worry about the impact of sleeping. Filtration Sterilization - The active water spring adopts 6 fine filtrations and ultraviolet sterilization to activate the water quality, purify and soften the water. Convenient to Use - With water shortage reminderand Auto power-off pump for dry running protection. 3.