Use quart refills with a variety of automatic air freshener units, including the API-2000 Units (Electric and Battery). Simply refill the fragrance included with your unit, add 1-2 wicks, depending on your air freshening needs, (12 wicks provided) to the liquid and enjoy the fresh scent. Each quart will refill your unit 6 times, deodorizing for approximately 6 months.  Wicks included.