This Solar Powered Mole Repeller is installed with its spike buried in the ground and works by emitting a sonic pulse into the ground every 25 seconds. Undetectable to humans and other animals, the noise repels moles without causing them harm. Eventually driving them away to find a new habitat. Larger gardens, or those with an irregular shape, will require more than one unit. A solar rechargeable power pack enables this mole Repeller to work continuously overnight and in poor light.