The Victor Electronic Rat Trap activates when a rat touches the metal plates inside the plastic housing, completing the circuit. The patent pending three plate design reduces escapes and provides a 90% kill rate. Kills rats in moments. A green indicator light flashes for up to 24 hours to signal that a rat is in the trap. Effective, quick kill. Easy to use, easy to bait with peanut butter. For indoor use. Requires 4 C batteries (not included). Can exterminate approximately 12 rats on one set of 4 C batteries (not included). Red light blinks for low battery. Caution: Inappropriate use may cause electrical shock or serious injury. Never use product around small children, small household pets, life support devices and combustible materials. See product warning for additional details.