Solar powered pest control products are a relatively new green product on the market. Solar panels on the top of the unit collect energy from the sun while the spike is buried underground. The device periodically shakes, sending vibrations through the ground to disturb and frighten animals. Models are available to repel moles and other vermin and at least one company makes a solar powered snake repellent. However, many gardeners are happy to see snakes in the garden, as they are natural predators of the smaller mammals that cause the most damage.