Victor Solar Powered Sonic Spikes offers a poison-free way to drive away moles, gophers. Every 30 seconds, sonic pulses penetrate the soil, emitting a penetrating sound that irritates moles and gophers, which are virtually blind and extremely sensitive to sound and vibrations. This method encourages moles to leave the property, and continues to discourage return visits. No batteries are required to operate the waterproof solar spike. A single solar charge will last up to 5 days. The spike is built with a mow-over design and safe to use around pets. Allow 7-14 days before moles and gophers start to move away from the area.