1. Keep distance from carpet, curtain and any sound absorption material that may reduce the effect.

2. The number of rodents and insects may increase in the first few days. And the pest repellent will drive them away completely for good about four weeks later.

3. 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. Reduction in pest activity should occur within 2-3 Weeks.

4. Ultrasonic sound can't penetrate furniture, cabinets or walls, keep ample space around the area where it's plugged in. To increase the effect, you should use several devices at the warehouse or several rooms.