Sold as 1 Each. Simplified user interface allows for easy, flexible programming to customize your fragrance experience. Countdown to empty digital display. Choose 1 59 minute intervals; Audible alarm option. Use the unique magnetic lock or convert to friction lock to ensure secure and continuous fragrancing. Sleek design: Available in white/metallic which compliments any environment. Operate with 2 or 4 AA batteries. LED low battery reminder. Reduced spending on type and quantity of batteries, and more efficient use of refills, means a reduction in operational spending by up to 75%!.