Battery operated ultrasonic spider repeller inaudible to the human ear. Ideal for homes, garages, loft spaces, outbuildings, sheds and greenhouses. Hide your repeller discretely on your ceiling or wall to keep it off of ground level and out of sight. Easy to install and totally safe, this product will not affect other pets, wildlife (except rodents) or humans. Of course, as with all methods involving animal behaviour, we can't guarantee effectiveness in every situation; however, our own experience and the feedback we get from customers suggests that this device is effective in almost all situations. If you need more advice on how to get the best out of the product, don't hesitate to give us a call.