Plug-ins and battery operated dispensers are among the most popular dispensing technologies. Glade Wisp Scented Oil Fragrance, by S.C. Johnson, releases a measured puff of fragrance every few seconds. According to the company, the product has an adjustable fragrance setting so the amount of fragrance can be controlled to suit individual needs. The unit is battery operated and portable, and is available in a variety of scent blends. The fragrance setting is adjustable, so the amount of fragrance may be controlled to an individual’s needs. S.C. Johnson also offers Glade PlugIns Scented Oil Light Show, which dispenses scent as it sends changing color washes across the wall.