Sweeneys Solar Power Mole & Gopher Spikes offer a chemical and poisen-free alternative for driving moles, gophers and other rodents out of your lawn. Sonic pulses penetrating through the soil every 30 seconds, sending burrowing rodents scurrying away. No batteries are required. One solar charge will last up to 5 days. Waterproof. Built with a mow-over design. Will not harm pets.