Elson Ultrasonic Mice Repellent Power Plugin Electronic Rat Repellent Pest Control Device Ultrasonic-the advanced and safe technology rid those nasty pest such as mice, ants, roaches etc from your home Safe-no harm to your children and pets, its completely safe for both your family and your pets Effective-uses the repellent for 7-15 days and you will find the machine is amazing (depending on the amount of infestation) Environmentally friendly-dont have to use some poisons or chemical traps to solve the mice problems by using this repellent Put 1 in Each Room is Better-for best & fastest results, be sure to order 1 device for each room in your household