This submersible pump is a great way to remove unwanted water from boats, pool covers, aquariums and sump pits. Convenient and safe, too, because it needs no electrical cord – runs up to 5 hours on three alkaline D batteries. Excellent for use as a portable pump-out device for paddle boats, inflatables, duck boats, dingies and kayaks. Any craŌ that lacks a hard-wire, permanent electrical system. 3-Year Warranty