1.Theory:

1)Electromagnetic is effective in controlling  cockroachs,and most other common pests.

2)Laboratory research has shown that Electromagnetic attacks the auditory and nervous systems of most common pests,and then cause them pain and discomfort.

Method:

1) Plug unit into socket of 110/220V AC wall outlet 

2)The green light shows that power supply is working. Red light, indicates that the system is working.