Riddex® Pro Pest Repeller will rid your home of rodents and roaches the safe, chemical-free way! Patented microprocessor uses electromagnetic technology to repel unwelcome mice, roaches and other vermin without killing them. No fumes, no mess, no traps or poison—and it works through walls! Safe for kids, cats and dogs. Unit plugs into a standard wall outlet and protects up to 2000 sq. ft. UL-listed. 4" H.