The Killer Tools 110V Ozone Generator, No. ART67-110, is designed to kill all bacteria, mold, viruses, allergens, and odors on contact. It's should not be used when people are present. It comes with a seven-day, 24-hour clock that can be set to run at night for less than an hour with the premises being sanitized for when employees and customers arrive the following morning. The unit is built in the U.S.A. with a one-year warranty.