Key Features: - It is applicable to repel cockroach, mosquito, insect, pest, mice etc. - The repelling ultrasonic frequency is 22 - 65KHz and the effective range is 80 - 120sqm - Non-toxic and environment-friendly - Safe and odorless - With ABS shell, durable and shock resistant - Power source: AC 90V - 250V, 50 - 60Hz Installation Method: 1. Install it on the power socket of the wall in the height of 20 - 80cm, ensuring vertical to the ground ( strictly forbid keep flat on the ground ). If there is no power socket of the same height in your home, and you need an external patch board to keep the product in the same height 2. Not allow tall barrier lying in the front of the product within 1 meter 3. The product needs to toward the open area, but you do not allow to choose the long-time open doors and windows ( or it will weaken ultrasonic intensity, decreasing the efficiency of rodent repellant ) 4. Try to avoid directly facing the curtain, fabric sofa, etc. and other fabric items ( because the fabric items can absorb ultrasonic wave ) 5. First, you need to install the product in the most severe area of rat damage, and after the mice are destroyed, transfer it in the center of the whole house ( such as living room ) or the mouse will easy to enter in Material: ABS Package Contents: 1 x Ultrasonic Pest Repeller