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1. The device will auto change frequency every hours to overcome moles adaptability for same frequency and enhance the effective. 2. Chases moles, burrowing rodents and snakes. 3. Power supply: solar energy cell, long-effective Ni-Mh cell recharged by solar energy. 4. The device can change rechargeable battery when the sound wave vibration becomes weak. 5. Waterproof level IP44 and no water seepage 6. Solar panels:polycrystalline silicon 2V/60Ma 7. Rechargeable battery: 1.2V/300Ma 8. Frequency: 400HZ-1000HZ. 9. Working range: 800 square meters.