The 60,000 BTU cordless propane powered forced air heater. Powered by propane and a 12-Volt lead acid battery, this is the future of jobsite heat. Cut the cord for 4-hours on a single 5-hour charge or 8-hours with an optional second battery. Equipped with Mr. Heater Patented Quiet Burner Technology, this heater burns with 50% less noise, making the jobsite safer and enabling you to work with a little more peace and quiet.