Effectiveness of the product depends largely upon soil type. Moist clay is the best conductor of sound; dry, sandy or peat soil does not conduct the sonic waves as easily.
These animals will be flee away after 2 weeks continuous use this mole repeller device, but some may dig closer because they have lost their mind under the irritation. 2 months of continuous use can effectively remove most of the mole and gothers. The solar mole spikes can be kept there to discourage the left ones or other pests which want to occupy the empty caves.