Sureguard Snake Repellents have been developed as a deterrent to many kinds of snakes. They emit a pulsing vibration into the surrounding soil. When the snake perceives the vibration as a source of danger most snakes will choose to avoid confrontation. (Similar principle to bushwalkers walking noisily to scare snakes away.) * Place multiple repellents up to 25m apart or up to 10m in sandy soil. *Typically place two repellents at the front and two at the rear of small residential properties.