Repel and prevent mice and rats using the high-frequency sound of Beacon Mouse and Rat Repeller. Easy to use and poison-free - simply plug into any socket of 24hr protection. Ideal for indoor use only, this very low-cost rodent control uses minimal power and offers a great alternative to baits and traps. Based on Ultrasonic technology, it cannot be heard by humans or non-rodent pets and will not affect cats, dogs, birds, reptiles or fish. Directions for use: Simply plug into an unobstructed wall socket. A high-frequency sound repels the mice and rats. It is recommended that you use one unit per room. Keep the unit on at all times for maximum protection.