What is the difference between the Rat Zapper Classic and the Ultra?
You will get a longer battery life and about 30 kills per set of recommended D-sized batteries with the larger-sized Rat Zapper Ultra, which can accommodate large rodents as well as small mice. It also features a special battery check light. The original Rat Zapper Classic will give you between 10 and 30 kills, depending on the type of AA-sized batteries being used.