Riddex PRO pest repeller drives roaches and rodents away. Innovative electromagnetic technology uses the wiring in your walls to keep your home pest free. No dangerous chemicals or traps needed, safe for children and pets. One plug-in unit covers an entire floor. Features built-in night light, on/off switch. Launched by Semiconductor. Plastic, 2 1/4 x 1 3/4 x 4 Electronic Pest Repeller uses electromagnetic waves, repels unwanted vermin without leaving a nasty smell or mess. Electronic Pest Repeller has no side effect or bad reaction to human beings and common pets like cats and dogs. It has no smell, no poison, no fumes and can be used for long term as it works non-stop. Electronic Pest Repeller comes with the additional function of switching frequency pulse accoustic waves to prevent adaptability of mouse and insects with "HIGH", "MEDIUM" or "LOW" plus "1" and "2" button for greater or normal protection. Suitable for use in home, offices, restaurants and warehouse. One unit of Electronic Pest Repeller each for your children's room is recommended. Just plug-in the Electronic Pest Repeller into any electrical socket and it will start working immediately for certain pests and will drive away most pest in 2 to 4 weeks. Warranty period: One year 30 days money back guarantee Note: This Electronic Pest Repeller is not suitable for use near pets like hamster and cricket.