Vekibee Pack of 4 Sonic Mole Repellent Solar Gopher Repellent Ultrasonic Vole Chaser Mole Deterrent Sonic Spike Gopher Stake Rodent Repellent Ultrasonic Pest Repellent Good As Mole Killer Poison Sonic Pulses Against Burrowing Rodents: Vekibee Solar Sonic Mole Repeller vibrates and emits 400 HZ low-frequency sonic pulses every 20 seconds to repel burrowing rodents. The vibrations and sonic pulses are harmless to human, pets and environment. Effective, Safe and Humane Rodent Repellent: The vibration and sonic pulses will penetrate the soil to create an unbearable environment for underground burrowing rodents to stay and force them to leave the property and seek out other places to live. Extensive Coverage: A solar powered sonic pest repellent radiates in all directions. It is recommended to use multiple devices to overlap providing even more coverage. It usually takes 2 - 4 weeks for mole, gopher, vole and other burrowing rodents to leave the area. Efficient Solar Charge: The solar mole repeller is charged by polysilicon solar panel to accumulate power for operation at dark hours. 4-hour solar charge lasts for 5 days, effectively and continuously preventing the return of rodents. Durability: Constructed with watertight, anti-corrosion, anti-UV aluminum spike and ABS plastic head unit, the solar sonic vole repellent is designed for outdoor pest control in patio, lawn and garden. The product life is about 2 years.