DESCRIPTION: 1.360 Degree Ultrasonic Rodent and Insect Repeller is effective in controlling mice, rats, roaches fleas, flies, crickets, silverfish, water bugs, moths, ants and most other common pests. 2.Laboratory research has shown ultrasonic sound waves attack the auditory and nervous systems of most common pests causing them pain and discomfort. With 140 decibels of sound pressure, pests will give up their source of food, water and shelter and move on. 3.These high-intensity sound waves are out of the range of hearing of humans and most household pets such as dogs, cats, fishes, birds, and farm animals. Dimensions: 75.25 (dia.) x 122 Weight: 340g Output sound pressure: 120dB / per speaker Coverage: the effective coverage can be 2500- 4000 sq. ft WARNING: 1.Do not place the device behind curtains, furniture or furnishing as this would reduce its effectiveness. Do not cover it with any object or sheet. 2.The environment have long time nobody stay,please pull out the plug. 3.That product is not waterproof,please do not used in damp environment or outdoor. 4.Don't place the device next to your ear when using test button.