This device helps pumps oxygen into the aquarium. But Unlike the electrical powered it uses the normal large tiger batteries.
Installation is easy: Fasten an end of a hose to the pump and the other end of the hose to the airstone and place the air stone inside the aquarium. Then turn on.
This item might not come with a hose. You can measure your aquarium and order for a hose lenght here for what is long enough for your aquarium