"This machine should be installed 20~30cm centimeter away from the floor and should be vertical to the floor and plug to the outlet.
The installing point should be avoided to be in the back of the curtain, fridge, and any other furniture that deterring or attaching frequency.
Within 1 meter shall not have a large obstacle (that is not installed in the refrigerator, wardrobe, sofa and other objects on the back).
It's normal that the mouse and vermin will increase at the beginning of the using days because they are getting away from the living place after the attack of the ultrasonic. Usually, it could take 3~4 weeks to notice results.
To increase the effect, you should use the several devices at the warehouse or several rooms."