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Notes: 1. This machine should be installed at 80-120 centimeter away from the floor, and vertical to the floor and plug to the power socket. 2. The installing point should be avoided from carpet, curtain etc attaching sound material. Otherwise, the decrease of the sound pressure will do harm on the effect. 3. It’s normal that the mouse and vermin will increase at the beginning of the using days. Because they are moving away from their living place after the attack of ultrasonic. 4. To increase the effect, you should use several sets of this machine at the warehouse or goods pile-up, for the best using range is 50 meters.