Product Description:The device has zero odor, soundless and is 100% safe to human and pets, Plus, the Ultrasonic Pest Repeller is environment-friendly, no radiation and non-toxic and it doesn't contain any hazardous chemicals, sprays, traps or insecticide elements, Rat repellent can be used with rest assured even with pregnant women and children at home,Each pest control has an effective coverage up to 861 square feet, It is recommended to install this pest repeller vertically from 7,8-31,5in away from the ground, Equipped each room with one pest repellent can achieve the best resultThe mosquito repellent is easy to carry and install with super mini body, Just plug the device into power sockets & see pests run away, The pest repller immediately drives away pests without any mess to protect your house from pest intrusion all the day