Ecology Safe Non-toxic: By abandoning harmful chemical repellents, the ultrasonic pest repellent is 100% safe and works effectively. The most advanced ultrasound technology can expel them from parasites without killing them. it is environmentally friendly and there is no need to clean up dead pests. You can get away from a wide variety of parasites such as rats, mosquitoes, ants, cockroaches, flies, bugs and more. Safe and friendly: Advanced ultrasonic technology. This device is environmentally friendly, non-toxic and tasteless, chemical-free, 100% safe and noise-free for children, pets and pregnant women. It can be safely used at home and effectively chase away parasites. It takes 3 to 4 weeks to take effect. Easy to install: just connect the Ultrasonic Repeller vertically to the power outlet. It is recommended to install the ultrasonic repellent 80-100cm above the ground for parasites such as mosquitoes or 20-30cm above the ground for rodents such as mice. It will start repelling