Makergroup Solar Mole&Gopher Repeller Chaser Outdoor Unltrasonic Pest Repeller for Moles, Voles, Rates,Snakes,Pests and Rodents Repeller(2-Pack) Will remove rodents from your garden yard or farm,Effective range approximately 100 feet Safe chemical free solar ultrasonic technology Every 30 seconds it sends out a vibration that scares pests away Dig a hole And bury 3/4 of the rod underground, It sends vibrations into the ground Waterproof, solar powered, on-off switch, rechargeable battery