Buzzer + Ultrasonic: Animal repellent repels animal intruders by Buzzer + ultrasonic for 2-3 seconds and pause for 20 alternating frequencies between 400-1000Hz, it can keep moles, waffles, voles away , dandruff and other destructive rodents. It is very effective in repelling moles and mice and not harmful to humans, pets and poultry, ideal for garden, farm, greenhouse. Solar Mole Repeller: Powered by solar cell, no need for extra batteries. Mole repellent does not need to be plugged into any type of power source. The solar panel of the ultrasonic solar repellent receives sunlight during the day. 4 hours of charging will allow the pest control ultrasound to continue working for 5 days. Waterproof and Anti-Corrosion: Anti-mole sun repellent suitable for all weather conditions. It is adopts waterproof and anti-corrosion design with IP65 waterproof level and made of high quality ABS material, does not pollute the ground even after long work. The green outer shell can be well hidden in plants and can also be used as a garden ornament. Large Effective Working Area: The solar mouse repellent device works in a square pattern, approximately 15m in radius and covering up to 650 square meters. effective distance: 6-8 meters depending on the size of the animal. To get the best possible result, we recommend that you install 2 devices every 20 feet for soil surfaces frequented by maternal seeds. Suitable for Multiple Locations: Each mole repellent has an effective range of up to 5,000 square feet. Our mole repellent comes with 2 pieces in one package, so you can cover small to large properties like lawns, yards, gardens, farms. If you have any questions, please do not hesitate to contact us. We will solve them wholeheartedly.