You should begin with preventive measures - watch out for cracks and holes in the walls of your house are buried them in a timely until they become rat moves. If rats have appeared on the walls, the best way to drive them out is to buy electronic rat repellers. These devices deter rodents by ultrasound – rats start to leave walls in a wild panic in search of a safe place. These repellers work best in empty spaces, not hammered by things and carpets. Nowadays there are many ultrasonic repellers - but we have collected only the best for you in the review Top 7 electronic rodent repellers.