HUMANE, HIGH VOLTAGE SHOCK: Once rodents enter the Rat Zapper trap, it delivers a continuous shock for 2 minutes to humanely kill mice and average-size rats EASY TO USE: Apply a small amount of bait to the back wall, insert 4 “AA” batteries, place the trap along the wall, and turn on the trap LED ALERTS: A blinking green LED light notifies you of a catch, so you easily know when it’s time to empty the trap without having to check manually NO SEE, NO TOUCH: Never touch a dead rodent – simply tip the Rat Zapper into the trash KILL UP TO 20 RATS: One set of 4 "AA" batteries will kill up to 20 rats (not included) INDOOR USE ONLY: The Rat Zapper mouse and rat trap is for indoor use only, including attics, garages, basements, and sheds