In an ideal environment, the DX-610, whether for rodent control, rat or mouse control, can be measured up to a 2,000 SF space on ONE level. An ideal environment is one that the unit is not directly blocked by furniture, draperies, or any other object. The unit should be plugged into a wall plug that is unobstructed. Soft materials like carpets, furniture, draperies can have an impact on the total coverage. Each application and customer environment will differ slightly. We recommend that units be places on ALL floors, basement, attic, and attached garage