OWLTRA OW-7 In-/Outdoor Electric Rodent Trap is the waterproof, humane solution to your rodent problem. It can be used outdoors or at damp places when using together with the waterproof cover that comes with the product. It has two ways of powering: You can use either 4 D batteries or USB cord as power source for the trap. It also comes with sound and light alarm that can remind you when to clean up after the trap eliminates the rodent.