An advanced sonic repeller that drives burrowing animals away by emitting low frequency ground vibrations, which creatures such as moles interpret as signs of an approaching intruder. The unit emits a low frequency vibration every 15 to 20 seconds, which is transmitted through the soil. The effectiveness of the mole repeller can be affected by soil density; chalky or sandy soil will not transmit the vibrations as effectively as solid clay-type soil. * Covers up to 9000 sq.ft