The Vicks Waterless Vaporizer works by heat activating scent pads to release soothing menthol vapors into the air. No water is necessary, perfect for humid areas or when dry air is not a problem. Includes 6 Vicks VaporPads (Menthol), each pad works up to 8 hours. Vicks Scent pads also fit Sunbeam, Halls, Evenflo, Vaporeye and VaporPlug. 1) Waterless - no spills or refilling, 2) Three settings for vapor strenght, 3) Soothing nightlight, 4) Silent operation, 5) Compact design is perfect for bedside.