The BIG D® LIGHT-ACTIVATED FAN DISPENSER is designed to hold gel deodorants. The dispenser has a micro processor switch that can be set to OFF, ON or AUTO, and it is light-activated, so it turns itself off when there is no light in the room, allowing more efficient use of batteries and odor control products. The LED indicator informs you the unit is operating. Constructed of sturdy ABS plastic, it has a sealed motor for long life. The LIGHT-ACTIVATED FAN DISPENSER operates on two alkaline batteries, which will last up to 180 days. Batteries not included. The dispenser covers 4,000 cu. ft. of space.