Innoo Tech Pest Control &ndash; Ultrasonic Pest Repeller Electronic with Latest Dual Wave Brands for All Kind of Insects and Rodents - Pest Repeller Ultrasonic with Blue Night Light Effective Protection - The repeller is with dual frequency bands which can effectively deter all manner of pests. The first band emits waves at a frequency of 25 to 75 kHz and will repel rats, mosquitoes and cockroaches. The second band, which uses an ultrasonic frequency of 10 to 70kHz, can deter spiders, insects and small rodents. The ultrasonic waves are harmless, but will make the pests uncomfortable, forcing them to leave the area. The First Band is 100% Safe - It will not affect humans, dogs, birds and most other pets. However, there is a small chance that cats, hamsters and other small rodents will be affected and made to feel uncomfortable. Therefore, if you have one of these pets, then using this repeller is not recommended. The Second Band Must be Used with Care - If there are human, dogs or other pets inside the house, please Do Not use 2nd band, because the 2nd band simulates mouse bitter screaming, it has so strong irritation to mice, mosquitoes and other pests that they must leave your home. On The Other Hand, it has certain irritation to human and pets as well, it will make people and pets feel uncomfortable. Environmentally Friendly - The device drives pests away harmlessly and gives you fantastic protection without using harmful sprays or traps that could be dangerous for your children or pets. It's the most humane way to keep pests at bay. Comprehensive Defense - The Innoo Tech Pest Control emits powerful ultrasonic waves that can keep pests from entering your home. It's effective in an area of up to 2700 feet. However, furniture and hard surfaces can affect how well the waves are transmitted and so it's recommended that you use several repellers in different areas if you have a large house or if you have a particularly bad pest problem.