1. Use inside and outside the cage --- You can fix it on the outside or inside of the cage according to your own needs. If your pet is naughty, it is recommended to install it outside the cage. You can easily turn the water supply on or off for cleaning and refilling. 2.No noise---This pet automatic water dispenser is designed with gravity flow, which can control the amount of water to prevent overflow. Compared to a water bottle with a ball bearing, it doesn't make an annoying noise when your pet drinks. Quiet design allows you to have a quiet night sleep environment. 3. Large capacity---500ml large capacity, if you are away from home all day, no longer worry about your pet not having enough water to drink. This water bottle is the perfect size for rats, hamsters, guinea pigs, baby ferrets, pygmy rabbits and other small pets. 4.Safe---Made of non-toxic and durable PP plastic. Compared to traditional water bottles and bowls, our hanging water dispensers provide your pet with a more comfortable and hygienic drinking experience. 5. EASY TO USE --- Easily and quickly attach to the inside of the cage with the included screws.