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Title: Do NOT buy these
Review: These are absolutely POS. We ordered 4, and when they arrived, one was already non-functional. The design is absurd- the "hook" you see in the picture is supposed to allow you to hang it on the edge of an aquarium, bucket, etc. but it is also supposed to lock the lid/battery compartment closed. Fat chance. Hanging it by the hook means the lid will open at the worst possible time, dunking you batteries in water (i.e. DEAD) and none of ours have recovered, even with new batteries. Taping the top shut with electric tape sorta works for awhile, but even when functional they produce an anemic air flow that won't even work if the bubble stone is too deep in the bucket (too deep meaning 6"). Just say no.
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