1. By emitting sound waves, the Solar Mole repellent drives Mole away very effectively. The sound waves will irritate them, simulate danger, and repel them away from the irradiated area. Transmitting sound waves every 40 seconds or so, the Solar Mole repellent is effective within an area of 650 square meters. 2. The Solar Gopher repellent radiates in all directions. Avoid any obstruction and let the sound waves be emitted freely. To make the best use of the product, we strongly recommend an installation of 2 devices every 30 meters for ground areas frequented by the mole. 3. The Solar Mole repellent's power is supplied by a solar cell, a rechargeable accumulator collecting power for operation at night. When the accumulator is fully charged, it can supply enough power for the dark hours, thus ensuring a continuous around-the-clock operation. 4. The Solar Mole Repellent had an additional battery cassette, you can replace the battery easily to lengthen the product using life. PRODUCT FEATURES Aosion Solar Mole Repelle Color: Blac Materials: ABS Plasti Power Supply: Solar powered and with 1*AA rechargeable battery(included Solar Panel Power: 4.5V/45M Solar Panel Dimension: 90X70M Function: Sonic+ Vibratio Frequency: 400-1000H Coverage: 650sq. APPLICATION: Garden, Pond, Yard, Manor, Farm... OEM, ODM SUPPORT