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Into the electronics that are housed in the top of the Rat Zapper Ulra as this may cause the electronics to short out and impair the unit’s performance. After cleaning and rinsing the bottom of the Rat Zapper Ultra thoroughly allow the water to drain and let your Rat Zapper Ultra air dry completely (do not use air. How to set and use the Rat Zapper Ultra. Rat Zapper Ultra Rodent Trap Review. This Rat Zapper review covers the Ultra model, a more robust version of the Zapper that kills more rodents per set of batteries. The Ultra Zapper has an easy-to-understand indicator that stays green for 2 seconds when the device is turned on. The light blinks red every 7 seconds after each successful kill.