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.Accurate electronic thermostat with push button power & mode setting. Dial for temperature & timer. Comes with an exceptional 3-year warranty. 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.