Aspectek&trade; Rotatable Ultrasonic Pest Control, Pest Repeller with Side Outlet and Adjustable Night Light - For Rodents, Rat, Mouse, Spider, Mosquito and Insect - Pack of 4 SAFE FOR HUMANS AND PETS:The Aspectek Indoor Pest Control Solution -Emits high-frequency ultrasonic waves that effectively repel rodents, while being completely inaudible to the human earsIf there is a unsatisfactory results after 3 weeks, contact us directly and we offer a full refund NO CHEMICAL: our ultrasonic pest repeller is no use of toxic or harsh chemicals, safe for use around children and household pets ACCURACY & AREA COVERAGE:our electronic Plug In repellent indoor -Rotate 180 to accurately emit the waves to the infested area. Coverage is up to 5000 sq. ft. (464.52 sq. m), without blockage or device coverage ADDITIONAL POWER OUTLET: A power outlet on the side of the ultrasonic pest repeller unit can be used for other electronic devices. No batteries or maintenance required. LED NIGHT LIGHT: LED light indicates that the pest repeller unit is working properly, which can be also used as night light