Effective on Mice, Bugs, Lizards, Spiders, Mosquitoes & Pests The Health Care System Ultrasonic Electro Magnetic Pest Repellers For Mosquito, Insect, Mouse & Cockroach. Ultrasonic Pest Repellent Device No Fumes, No Harmful Rays, No Bad Odour No Mats, No Chemicals, No Sprays Easy to use, easy to operate. Virgin plastic, high quality material. Simple, elegant product. 100% shock proof, advanced technology