This mole repellent device uses sonic frequencies to penetrate the soil to scare away burying pests such as gopher, snake, mole, groundhog, rodent, chipmunk, armadillos and other pests, humanely drive away moles and gophers that can harm your soil. Weatherproof mole repellent spikes, it can free use in rainy day. Own it now and protect your garden or yard!!! Package Includes 4 x Mole repellent stakes Specifications Solar Panel Size:56 x 56mm Effective Range: approximately 7000 sq. ft. Material: ABS Plastic Working way: buzzer Cycle Interval: Appr 20 Seconds NOTE: 1. When first installed, it require up to 2 days of the sunlight to be fully effective. 2.Insert mole repellent stakes into ground,make sure the top is above to the surface roughly 2 inches 3. Position the mole repellent solar powered where it gets full sun on the panel to recharge the unit 4. The mole repellent need be used continuously for 7-14 days before ground rodents start to move away from the area 5. The harder/denser the soil, the better it works, as the sonic vibrations do not travel well through loamy soil conditions