Egg Blow / Blow

Some times，when the water in the pet blow is going to drink over or already over,we will
easy forget to watering.Why? Becaues water is transpanrent So,we designed this Egg Blow,
it can solves the problem whith skillfully.There is a layer of material with CWW (coloration
when wet) principle.when you watering the water to this blow,it will become yellow where
were touched the water,and the blow look like a sunny egg. If the yolk is smaller or disapp-
ear.It is remind you should watering for pet.