This is the pest repeller that deters rodents and unwanted pests without the use of harsh chemicals, poisons, or traps. It plugs into a standard AC outlet and delivers an ultrasonic frequency that is inaudible to humans and helps drive pests away. The unit also sends electrical impulses through the walls of your home (at random intervals) to further repel pests. In addition, it employs negative ion technology that helps clean the air of bacteria and odors that may attract new pests. It is intended for indoor use only and has LED indicators. AC plug.