SUNSKY - Ultrasonic Electronic Cockroach Mosquito Pest
4. The Ultrasonic pest repellent is effective for an area up to 50-80sqm. However, as the ultrasonic wave is Fast Decay & Poor Penetration, it can''t cross the wall. 5. Injure or kill pests such as rodents and insects including cockroach, mosquito, rats, etc. Widely use in home, warehouse, hotel, hospital, etc. 6.