Solar Powered: Works with a rechargeable solar battery. 4 hours of charging the ultrasonic solar repellent in sunlight is enough to maintain its effect for 4 days. The mole repellent stakes will emit low frequency pulses for 3-4 seconds every 20 seconds. Note: Please keep the solar pest repellent stakes ready to charge for at least 2 days before installation. Safe for Children and Pets: No chemicals or poisons are used in this process. The anti mole stakes will emit low frequency pulses for 3-4 seconds every 20 seconds. They penetrate through the soil and deter them from entering the protected area. The humanized way to repel moles. The repellent protects the roots of lawns, vegetable fields, flowers and seedlings. Prevents moles from tunneling. Large Coverage: Each mole repellent has an effective range of up to 796.8 m². For optimal effect, it is recommended to place mole repellent every 70 feet in your lawn. Set of 8 mole repellent for an excellent environment. Waterproof: The