Sweeney's S9014 Solar Powered Mole & Gopher Repellent Sonic Spike (Pack of 4) (4) Solar Mole Repeller Spikes: An environmentally friendly, chemical-free way to repel moles and gophers from your lawn or garden Solar powered sonic spike offers a non-toxic alternative for driving moles and gophers out of your yard Sonic pulses only rodents can hear penetrate the soil, sending underground pests scurrying away. No batteries required, solar charge lasts up to 5 days