The ultrasonic repeller does not use any harmful or toxic chemicals to repel rodents without harming themselves. The exterior insect-proof zone embeds itself in the ground to start its functions. The snake repeller is also made of high quality ABS material, so it brings a stable feeling when gripping and ensures maximum durability and longevity. For best performance, we recommend you to place the mole repellent every 90 feet of your lawn. The sound pulses emit sound pulses every 30 seconds, they penetrate the soil and also cause the pests to evacuate the area through which the sound travels. Generally, it takes about 2-4 weeks for the moles and the gophers are driven out of your garden. Your garden will be rodent-free. Relax knowing your lawn is protected even when it rains due to the waterproof and corrosion-resistant features of the Mole and Vole Repellent Spikes. Aimed to keep our environment clean, we drive the use of eco-friendly energy: solar power and rechargeable battery for the pest repellent. It can absorb the sun for daily use. In the absence of sunlight, this mole trap has a battery charge of 3-4 hours and provides 5-7 days of use.