The Vicks Waterless Vaporizer works by heat activating the soothing Vicks menthol vapors in the scent pad and releasing them into the air. No water is necessary; perfect for humid areas or when dry air is not a problem. Scent pad with soothing Vicks menthol vapors will last up to 8 hours. Soft nightlight helps locate waterless vaporizer in a dark room. Advanced heater technology offers precise temperature settings. Three settings to control the amount of soothing vapors released into the air. Uses Vicks Vapor Pads. Waterless, no spills or refilling. Three scent levels. Silent operation, perfect for bedside use. Includes 5 Vicks VapoPads.