it.innovative technology Ultrasonic Rodent Repeller Commercial Triple Speaker Model Repels Rodents, Rats & Mice. Triple Speaker 180 Degrees of Signal Blast. UL Listed, EPA and Health Canada PCP Act Registration No. 29215 Non Toxic Rodent Control Sounds Like A Jack Hammer to Rats and Mice. Ultrasonic signal constantly modulates between 32 and 62 kHz so rodents cannot adapt! 110V U.S. Plug Type only. Does not function on a plug converter. Operates on average on less than .20 cents per month. Signal is silent - while slight audible HUM ensures the unit is functioning. Powerful 110db output as measured from one meter distance from the speaker.