Insect Repellent with 25kHz Frequency, Measures 13.5 x 7.5 x 9.5cm Efficient range: 60m2 Frequency of ultrasonic wave: 25kHz Repell various insects such as mouse, black beetle, mosquito Composed by micro-computer controller Pulse and frequency carrier Launch special pulse magnetic wave and pulse ultrasonic wave to stimulating hearing and nervous system of mouse, black beetle, mosquito Cause them upset and pains so as to drive them out from house Discontinuity working design, which enable it lasting running No influence to house appliances and no harmful to human body Unit measurements: 13.5 x 7.5 x 9.5cm Packing: blister card/color box, 60 pieces/carton Innner box measurements: 8.4 x 8.4 x 13.6cm