Ultra-Low Volume (ULV) concentrates are described as:

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Ultra-Low Volume concentrates are highly concentrated pesticides designed to treat large areas with only a tiny amount of liquid. They’re applied as ultra-fine droplets using specialized equipment, so a small volume of spray covers a big area. Because the active ingredient is highly concentrated, there’s more potential for exposure during application, which is why this approach requires equipment that can reliably create the fine mist and limit drift, along with proper safety measures. That combination—small spray volumes with a high concentration and the need for precise, drift-reducing equipment—captures why this option is the best description. The other statements don’t fit: many ULV products still require some dilution or preparation, they are not free of hazards to users, and they’re used outdoors as well as indoors depending on the pest problem.