Say no to nasty pests with this Pest XT 4-In-1 Indoor Ultrasonic Pest Repeller Designed to send out ultrasonic sound-waves and use electromagnetic technology Helps to repel insects and pests such as rats, mice and spiders Electromagnetic field affects the nervous system of pests and drives them outside The high frequency, short wavelength sound-waves are inaudible to humans Dimensions: 11cm (H) x 8cm (W)  Check out this absolute germ of a deal on the Indoor Ultrasonic Pest Repeller - save 40%