After plugging the power on the wall, you can see the blue indicator light and the machine begin to work, Also you can hear electronic scanning sound from high frequency to low frequency
This machine should be installed at 20-80 centimeter away from the floor, and should be vertica 1 to the floor and plug to the power socket
its normal that the mouse and vermin will increase at the beginning of the using days because they will get away from their living place after the attack of the ulterasonic.