LOMEREY 4 Pack Solar Sonic Mole Repeller Gopher Repellent Ultrasonic Vole Chaser Mole Spike Rodent Repellant Ultrasonic Pest Deterrent Get Rid of Mole in Yard Outdoor Pest Control LOMEREY Mole, Gopher, Vole Sonic Repellent repels moles, gophers, voles, burrowing rodents in lawn Emits sonic pulses penetrating the soil and forces pests to evacuate the area covered by the sound The sonic pulses are emitted at 400 Hz in all directions every 20 seconds, pests are deterred unharmed Usually takes about 2 weeks before results will be seen, sometimes may take longer depending on soil density and mole activity 4 hours charging in full sunlight develops a full solar charge, which should last for 5 days