Vktech&reg; Solar Powered Ultrasonic Mouse Rat Bug Pest Repeller Garden Rat Expeller Solar powered with rechargeable battery No poison and no chemical, Have no effect on animals or pets Effective within an area of 650 square meters Via solar energy to charge the battery, generating ultrasound stimulated rat central nervous system, to achieve the purpose of driving away the mouse Ideal pest contral device to keep rodents away from your garden or lawns by utilizing both sonic wave sound and vibration technology