Keep mice, rats and other pests out of your home with the superior technology of Rid Rite Advanced Electronic Pest Control Systems. Rid Rite pest control systems emit an ever changing pattern of ultrasonic frequencies to help control pests and keep them out of your living space. The advanced technology has built-in daytime and nighttime control. Built-in Output control provides enhanced performance at night when pests are most active. The built-in light Sensor automatically controls the enhanced output so you don't have to.