What’s the difference between the Rat Zapper Classic and the Ultra?
You’ll get longer battery life and about 50 kills per set of regular D-size alkaline batteries with the larger-sized Rat Zapper Ultra, which works on bigger rodents. It also comes with a special battery check light. The original Rat Zapper Classic will give you about 30 kills with AA alkaline, or about 50 kills with AA Lithiums.