Design & Material: Design in fashion stylish.in order to avoid the water spill out of everywhere,according to this problem,designed in safe locking.we adopted in food grade ABS and Silicone Seal ring for leak proof.To ensure safety put in you handbag.Special Gift to Your Dog: For you dog,this can improve dog drink quality,so that we put the activated carbon in bottle for absorb impurities to purify the water .not only you can feel relaxed about your dog health,but also can safe to drink by dog.One-Hand to Feed: If you call someone or busy doing something, you dont have a time feeder water for dog.we take that into account ,so we have designed one-hand feeding with one-key to lock/open.How to Install: The filter element combine with activated carbon,then until the tighten,just push-in the bottle.thats all.Good Quality: Shatter-resistant .when the bottle fall down floor ,Dont worry about it .it is made for a high polymer material.