Working Principle of Birds Deterrent: Once animals enter the protection range, the PIR sensor starts to work, then it will emit ultrasonic waves, alarm, and strong flashing light. Perfect to scare-off Squirrels, Raccoons, Skunks, Rabbits, Moles, Dogs, Cats, Wild Boars, Birds, and many other animals from your house, garden, yard, and surrounding area.It is also a Solar Mole Repeller: The generated pulses of sound are used to drive away animals such as snakes and moles. The pulses make the animals think that underground vibrations are happening and that this is a danger zone, so they flee quickly.Powered By Solar Energy: Solar Animal Repeller is equipped with solar panel on the top, rechargeable, high efficiency and low power consumption. Different from other solar animal repellersthe angle of the solar panel can be adjusted to get more sunlight.Multi Modes: Our Outdoor Ultrasonic Wild Animal Repeller has different modes. Different frequency, sensitivity and working modes that you can choose. Choose "Frequency" to adjust different frequency for different animals, choose "Sensitivity" to adjust the detection range, choose Operating time to select working version.Guarantee: 60 days refund and 12 months replacement. If you have any problem when you use, please contact us any time, we are always here to help you.