【Ultrasonic Vibration Repellent】Emits sound pulses every 20 seconds, which penetrate the ground and force pests to evacuate the area covered by the sound. The ultrasonic waves irritate them, simulating danger and repelling them from the irradiated area. 【Solar Energy】Equipped with solar panels and rechargeable batteries, capable of absorbing sunlight and having a longer working time. The battery does not need to be replaced. In the absence of direct sunlight, the Mole Repellent has a battery charging time of 3 to 4 hours for 5 to 7 days of use. 【Environmentally Friendly and Safe】Busy rodents are virtually blind, but extremely sensitive to sound and vibration. Our sonic mole repellent emits sonic pulses and ultrasonic waves without any use of harmful or toxic chemicals, which is 100% safe for children, pets and people. Will not pollute your garden and farm plants or crops. 【Waterproof and Durable】Made of high quality ABS and aluminum materials, corrosion resistant, safe and chemical