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 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. FOUR FUNCTION SWITCHES: 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). You can even adjust intensity in this mode. POWERFUL ADVANCED DESIGN: MAGIC CAT squirrel repellent is equipped with a transducer and dual speakers, which can emit high impact pressure wave and 25KHz-65KHz changing ultrasonic sounds to disturbe the central nervous systems of pest in your house. Creating an unfriendly living environment for rodents to discourage them from entering the protected area again in a long term. EPA Est. HUMANE & ECO-FRIENDLY: Unlike poisons, traps or other repellent devices, the MAGIC CAT cruelty-free pest repellent is a humane way to drive pest away with harmless ultrasonic sounds and pressure waves instead of killing them, so there is no need for you to worry about cleaning up. It does not only minimizes the direct contact between human and other disease-bearing rodent, but also protect the environment and maintain the balance between human and nature.