"Advanced: generate electromagnetic wave and ultrasonic wave at the same time. Frequency: change constantly and intermittently, but not periodically.Adjustable wave band: 1 band(25-70KHz) and 2 band(10-70KHz) for different situations. Comfortable: with nightlight function, soft blue light can also boost the repelling effects. Safe: use physical method, non-toxic, no harm to human beings or pets. Powerful: the effective protection range is about 200 square meters under open environment. Suitable for using in household, office, supermarket, hotel or storehouse, repelling pests effectively. Specifications: Color: White Material: ABS Voltage: AC 110-240V Power: 6W Electromagnetic Wave Frequency: 0.8Hz-8Hz Ultrasonic Wave Frequency: 1 Band: 25-70KHz; 2 Band: 10-70KHzProtection Range: About 200 square meters under open environment Note: 1. Please choose 1 band Ultrasonic Wave if you raise pets at home, because 12-20KHz ultrasonic wave would have some effects on pets. 2. It's normal reaction