1. A MUST FOR BUSY PET-KEEPER: If you travel frequently and worry about your small pet does not have enough water, this 500ml water bottle is a must for you.  It ensures that your pets stay hydrated while you are away without making a mess in their cage. 2. USED INSIDE AND OUTSIDE THE CAGE: You can attach it to the outside or inside of the cage according to your own needs.  If your pet is naughty, it is suggested to install it outside the cage.  And you can easily snap the water feeder on or off for cleaning and refilling. 3. NO NOISE WHEN DRINKING WATER: pet automatic water dispenser adopts gravity flow design and can control the amount of water to prevent overflow. It doesn't make annoying noises while your pet is drinking compared to water bottles with ball bearings. 4. MAKE YOUR DARLING MORE COMFORTABLE: Compared to traditional water bottles and bowls, our hanging water fountain provides your pet with a more comfortable and hygienic drinking experience.  Secure it at the right height of your cage, they will not have to raise up their neck. 5. DUSTPROOF AND LEAKPROOF: The sealing design prevents water leakage and dust from entering.  Compared with large water bowls, the water is not easily polluted and it will not cause mouth inflammation because their chin is exposed to water for a long time.