Professional Ultrasonic Pest Repeller Indoor: ultrasonic pest repeller indoor has been updated with the latest version of the ultrasonic chip, which can continuously change the frequency, stimulate and damage the nervous system of pests, and keep pests and rodents away from your house. Suitable for pests such as mice, mosquitoes, cockroaches, ants, bugs, rats, etc. Energy Saving & Convenient: After repeated and strict testing, ultrasonic pest / rodent / insect repellent indoor can work for a long time, consuming less than 3 kWh of electricity per month, which is ultra-low-power and more energy-efficient. And this ultrasonic pest / rodent / insect repellent is very convenient to use, just plug it into a power outlet. When the blue light comes on, it means the insect repellent is working. Higher Safety Performance: Compared with mosquito repellent incense, traps, and spray, which are traditional pest control ways to repel away pests, the electronic pest / rodent / insect repellent plug in, which is a physical repel mode, will be safer. It is non-toxic and harmless, and will not harm people and pets. No Noise & Quieter: ultrasonic pest repellent indoor plug-in produces low-frequency ultrasound, a frequency that humans cannot hear and is only useful for rodents, pests and insects. Even if the ultrasonic pest repellent works at night, it will not affect your sleep at all. Expand Coverage: ultrasonic pest repellent plug in has a coverage range of up to 1615 square feet, suitable for indoor scenes such as house, warehouse, office, attic, hotel, etc. (Note: sturdy objects/walls can weaken the impact of ultrasound. It is recommended to use one unit per room, and for rooms with large areas, please use multiple units.)