1. Can be hung on the cageThe hanging feeder and automatic waterer can be hung on the cage. Rotary knobs allow you to hang them tightly on the cage.2. Can be placed on the groundA flat bottom also allows the feeder to be put on the ground when you decide to take your pets out of the cage.3. Refills itself by the gravityGravity feeding technology does all the work for you. They dispense food and water as your pets empty the bowls.4. Twisting Lock to Prevent Water Leakagethere is a twisting lock on the waterer which allows you to place the water bottle tightly so that there won't be any leaking.