2 Person Ceramic Infrared Sauna Model: ESR202HCE Ceramic heating elements create infrared light. The human eye cannot see this light, but our bodies can feel it in the form of heat. Infrared rays heat your body directly without heaving to heat the air in-between you and hte heater through a process called conversion. Infrared light penetrates your body deep into the muscle tissue heating you from the inside out.Our Ceramic Heater Saunas feature: Full 2 person capacity Exterior Dimensions (WDH): 47″ x 45″ x 75″ Interior and exterior LED control panel Radio w/CD and MP3 auxiliary connection 2 Dynamic Speakers with Pre Amp Canadian Hemlock Fir wood construction Electrical service: 110V/15amp Internal Oxygen Ionizer 2 Ergonomic Backrests 2 Interior reading light 5 Ceramic Infrared heaters Tempered glass door Magazine and Towel Rack with Hook Color Chromotherapy LED lights Weighs 335 lbs. Fresh Air Roof vent Limited Five Year Manufacturer's Warranty on wood, structure, heaters and electrical. 1 year warranty on accessories. ETL approved in US and Canada.