Apello Gophers Chipmunk Repellent Ultrasonic Outdoor The mole repellent send out sonic pulses and vibrations every 30 seconds, which highly irritating to mole, gopher, vole repellent and other underground burrowing rodents to flee away from the coverage area. The repeller can be kept at there to continue to discourage the return visits. Powered by a rechargeable solar cell, no need for extra batteries. An energy-saving and environment-friendly ultrasonic pest control product with non toxic. It's almost the simplest way to get rid of moles, gophers and voles. Be safe to use around pets and human, no chemicals or poisons. This ultrasonic pest repeller repels pesky rodents in a humane way. No more traps, no more killer, no dispose of the body. A solar powered sonic pest repellent radiates in all directions. It's recommended to use multiple devices to overlap providing even more coverage. A solar powered product that you can install it at any places of your yard, garden or lawn with sun exposure. Solar cells can be fully charged in 8 hours and last for 5 days. Waterproof and corrosion-resistant aluminum and ABS flame retardant material also applies to rainy days. Insert pest control products into the soil, and make sure the top part is about 2 inches above the ground to avoid water flowing into the interior.