PEST A CATOR 1000 is recommended for smaller homes (generally regarded as 1000 square feet or less). Multiple units are needed for multiple stories. We recommend the PEST A CATOR 2000 for larger single-level dwellings. The direct plug-in feature is user friendly. Completely maintenance free! No chemical that washes away, no traps that require emptying dead or dying animals. Safe to use around children and household pets (except rodent type pets), the PEST A CATOR may actually help in reducing monthly exterminator costs. PEST A CATOR is a quality product proudly manufactured in the USA.!