The design combines the drinking trough and the cup , which satisfied ergonomics . And it ‘ s convenient for one – handed operation ,also makes easier for the owner to feed pet water and make sure it does not leak when inverted in З60 degrees . Designed with lanyard on the top , which is also easy to carry . With 300 ML water capacity and O-shaped drinking trough design , so it ＇ s more suitable for dog ＇ s oral structure , and also can prevent water from spilling . It ’ s also suitable for all kinds of dogs in any sizes to use outdoors for a long time .Equipped with a large button of drainage , makes sure that the water comes out as soon as you press the button . It ＇ s also reliable and very safe . The button is placed at the bottom to lock the water . A built – in silicone seal makes sure it ＇ s double waterproof and leak proof . It you press the button for a long time and make the Cup erect , it can make the water flow back into the Cup .