Solar - Powered: It is powered by solar rechargeable batteries. 4 hours of charging in sunlight is enough to keep them working for 4 days. Mole Repellent Stakes deliver low frequency pulses of 3-4 seconds every 20 seconds. Note: Charge the solar repellent in the sun for at least 2 days before installation.Safe around children and pets: No chemicals or poisons are used in this procedure. Mole Repellent Stakes deliver low frequency pulses of 3-4 seconds every 20 seconds. It penetrates the soil and prevents them from entering the reserve. Humanely expel moles from digging tunnels and causing damage to lawns, vegetable fields, flowers and seedling roots.Wide Coverage: Each rodent repellant is effective up to 7000 square feet. Yard rodent repellants are recommended every 70 feet throughout the lawn for optimum performance.WATERPROOF: The Gopher Repellent Solar Panel is protected by a waterproof ABS plastic case. Therefore, rodent repellants can work even on rainy days. Keep solar panels clean - wipe them regularly with a damp cloth. Dirty panels reduce the amount of sunlight available to charge your device's battery.Product size: 26*5.5cm