Safety : The Rodent Repellent does not use any chemicals or poisons but just high-frequency sound waves which do not harm people or pets like cats and dogs as it does not involve the use of chemicals. 4 Kinds of Operating Modes : Mouse repellent can free to set a repelling mode based on your needs. 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). Easy Application : Plugging this device and it will start doing its work to protect an area measuring 5,000-6,000 Sq.ft effectively, protect your RV, garage, rooms, attic, basement, warehouse, barn, kitchen, office, anywhere indoors. Powerful & Advanced Design: 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. Humane & Eco-friendly: Unlike other repellent devices, this pe st repeller is a humane way to drive pest 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. Colour:Photo Color Material:ABS Size:21.5 x 121.5 x 76mm Package Contents: 2 x Pest Repeller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.