You’ve cleaned up the yard and house, the car is waxed — ready for work tomorrow — and you go to bed on a Sunday night ready for Monday. Only when you step outside to beat the rush hour traffic the next morning you find your yard, car and home covered in bird droppings and feathers. What a waste of time and effort your hours of clean up were: birds, at times, can leave an unsightly and potentially dangerous mess.
Devices emitting high frequency noise are often advertised as being able to repel pests via ultrasonic sound. They are, according to their manufacturers, specifically designed to repel, injure or even eradicate pests — such as insects and rodents — completely. However, it should be noted that both testing labs and the US Federal Trade Commission (otherwise known as the FTC) dispute these claims.