[Simple & Easy to use]: rondent repellent consists of transducer and dual speakers, emits high impact pressure wave and 25KHz-60KHz changing ultrasonic sounds, effective in controlling squirrels,rats, mice, and most of the other common rondents intensively; [4 Kinds of Operating Modes]: MAGIC CAT mouse repellent has four function switches for you to adjust the operation modes. TEST = test tone (Simulates the sounds that rodents hear, check the ultrasonic sound works or not). ULTRA = ultrasonic sound (Repels mice effectively). TRANS = pressure waves (Repels rats & squirrels effectively). DUO = pressure waves + ultrasonic sound(Repels all rodents that mentioned above) ; [Highly Effective Operation]: Four different sound modes to choose from based on the environment: TEST, ULTRA, TRANS,DUO; It can keep squirrels, chipmunk, mice, rats and most of the other common rodents away from your indoor area effectively. Since squirrels are common throughout USA, it is a effective way to deter squirrels by achieving a long-term and cost-effective solution; [Safe & Easy to Use]:Forget the harmful chemicals, poisons, and traps typically used in households, all you need to do is plugging this device and it will start doing its work to protect an area measuring 5,000-6,000 Sq.ft effectively. The ultrasonic rodent repeller is 100% safe to human and pets because it drives away rodents like rats and squirrels without using any chemicals or poisons but just high-frequency sound waves which do not harm people or pets like cats and dogs; [Scope of application]: It is suitable for using in home, apartment, restaurant, school, office, basement or any indoor areas, It will start working. Before using the ultrasonic squirrel repellent, make sure there are no obstacles, such as curtains or cabinet coverings. The unit should be continuously used for at least 2-3 weeks, so as not to interrupt the effect.