Repel Moles and GophersThe mole repellent is powered by solar panels. Just put in the sunlight on the solar mole repellent ultrasonic charge for 4 hours, it is enough to make them work for 4 days. No need to replace the batteries. Note: Place the solar mouse repeller pile in the sunlight to charge for at least 2 days before installation. Powerful ProtectionThe mole spikes work in a circular pattern,each vole repellent outdoor has an effective range of up to 7000 sq ft. Recommend an installation of the yard mole repellents on every 70 feet throughout your lawn for optimal performance.The best place to put it is where the moles frequent. Harmless to Children&PetsThe mole repellent solar powered emit low frequency pulses for 3-4 seconds every 20 seconds, penetrating the soil and get rid of moles in your yard. No chemicals or poisons,repels moles in a humane way, preventing moles from burrowing into tunnels and causing damage to lawns, vegetable patches, flowers and seedling roots. WaterproofThe gopher repellent is made of high quality ABS plastic. So the mole repellent can work even in rainy days.A dirty panel will reduce the amount of sunlight available to charge the unit’s batteries.Keep the Solar Panel Clean - Wiping it regularly with a damp cloth. Easy to installUse a wooden or steel rod to make pilot hole. Insert the solar mole repellent ultrasonic into the ground until the cap is about 2 inches above the ground. Press the ON/OFF button one time to turn it on and that's all.In general, it need about 2-4 weeks to drive the Mole and vole away from your garden.