Multi-function - This machine combines a salon-quality facial steamer, with UV sterilization, along with an adjustable, magnified inspection lamp. Lamp can be used as a light only, magnifier only, or as a lighted magnifier. Excellent steam production - Transforms distilled water into pore-opening, muscle-relaxing, heated steam / vapor. Large, heavy-duty glass water reservoir (empty jar capacity is 27 ounces to upper fill line), and top-mounted water inlet makes this steamer easy to fill and use. Sprays approximately 24 ounces of water per hour. Superb UV sterilization - Steamer-Nozzle houses a premium, long-life (10,000 hour rated), 4-watt, ultraviolet bulb. The UV rays (commonly referred to as "ozone") from this bulb sterilize the steam as it passes through the steamer arm. Two operating modes - Steam only and steam plus ozone. Vapor (steam) and ozone (UV) functions have separate on/off switches and bright lighted indicators.