MH35CLP, Hero, Cordless, Forced Air Propane Heater, 35,000 BTU Per Hour, Heats Up To 800 SQFT, Built In Rechargeable Battery, Runs Up To 8 Hour Charge, Recharges In 5 Hours, Operates While Charging, Runs Up To 12 Hours On 20 LB Tank, 50% Quieter Than Standard Heater, ETL Certified.