Our Satisfaction Guarantee: If you're not satisfied with the performance of this product, return it to us within 60 days and provided you've had it running for at least a month, we'll refund the cost of the item (less carriage). Any questions about the best way to use this product, speak to our experts on 0118 903 5210 How well does it work? For every 1000 sold, we've had less than 1% returned as ineffective. These results are corroborated by independent figures provided by the manufacturer of the product. How quickly does it work? Most problems will disappear within a few days. However, if the rodents have already built a nest in your house, they are unlikely to desert their young until they are old enough to move. Fortunately, rodents mature quickly and the babies will be fully grown within a month. If you suspect that there is a nest in your house you can speed up the removal process with traps, but remember that traps alone do not provide a long-term solution to your problem.