AVANTEK Ultrasonic Pest Repeller Electronic Plug-In Pest Repellent and Pest Control - Repels Mice, Rats, Other Insects POWERFUL & EFFECTIVE: Applies ultrasonic technology to make the mice and pests uncomfortable; drives pests away from your home for good ADVANCED TECHNOLOGY: Alternately emits a super low frequency electromagnetic wave and two kinds of ultrasonic waves; mice and pests will fail to adapt to the frequencies; more effective than traditional single wave pest repeller EASY TO USE: Simply plug-in and use with hassle-free settings; features in energy efficient design to conserve the electric power SAFE & USER-FRIENDLY: Efficiently drives mice and pests away without using any toxics or chemicals, leaving no mess to clean; totally harmless to human and pets TO BE MORE EFFECTIVE: Use one unit in each room; minimizes pests activities within couple weeks