The GDO water dog bottle is designed to conveniently water your dog with out having to carry around a bowl. The bottle holds 16 oz of fluid and has a built in cup for a lid. Simply push the fill button, tip the bottle to fill the cup. The bottle has a built in lock to prevent accidentally filling up the cup. The bottle comes with a protective carrying sleeve that is designed to be attached to a belt or MOLLE system. You can also hang it by the strap and carabiner for easy access. No batteries required.