The Dr. Infrared Heater has a proven track record of being the most reliable portable infrared zone heater ever built. Thousands and thousands of customers have purchased more than one and many more have referred the DR-968 to their friends and families. Designed & Engineered in the USA Accurate electronic thermostat with push button power & mode setting. Dial for temperature & timer. Comes with an exceptional 3-year warranty. Extensive Safety & Comfort Features Built-in Overheat and Tip-Over Protection with a 12-hour automatic shut-off timer. Super quiet ball bearing high-pressure low noise blower with the level of only 39 dB. Uses standard 110v 3 prong outlet and listed by Underwriters Laboratories (UL) USA & Canada. DR. INFRARED HEATER'S DR968 CORE FEATURES Heat Up for a large room Dual Heating System: Infrared Quartz tube + PTC for 60% more heat than others. Rated around 5200 BTU. 3-Year Limited Warranty Engineered and Designed in the USA. Listed by Underwriters Laboratori