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 the stake into ground,make sure the top is above to the surface roughly 2 inches. 3. Position the device 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.