How to use:                                                                                                                                1. Plug unit into socket of 110/220V AC wall outlet 

2.when the button in the middle,that will stop working 

3.When the button in the light(Variable), the red LED pilot lamp will light up indicating that emit the variable ultrasonic waves drive the pests away. 

4.When the button in the right(Fixed), the green LED pilot lamp will light up indicating that emit the fixed ultrasonic waves repel the pests . 

5.You can turn to different button have different affect or better affect to the pests. 

Feature:

Material:ABS fireproof                                                                            Voltage:110V/220V