A domestic version of the pest control unit used by farms warehouses and supermarkets this commercial grade repeller will prevent the problem of mice and rats throughout your home the unit is ideally sized for the largest room and uses ultrasonic waves that cause distress to rodents but cant be heard by humans dogs cats birds or fishmodern slimline designcovers up to 1 000sqftmeasures 3 x 3 x mains poweredpack of 2 plus 1 free