Portable electronic pacemaker with thermostat, dump and overheat protection, safe for children and pets: heater made of flame retardant material, zero fire hazard; The automatic overheating protection system automatically shuts down the device when the overheating limit is reached; The tipping switch will be triggered at the bottom, and the device will turn off tilt or triple conditions; The power LED indicates plug-in; Circuit breakers are certified and safety tested.* Fast Heating: Featuring PTC ceramic heating technology and a high-speed fan, this heater heats a large number of heaters up to 200 square feet in minutes. Heating the entire house helps save on electricity bills by heating the small space needed instead of using other centralized heaters. Less than 45 dB when working, quiet enough and good heat dissipation for indoor sleep, reading and work.* Easy to use: adjust the knob to the right to turn on the device. "I" is used to generate heat 750 Wh and "II" will generate heat faster and 1500 Wh, the "fan" blows out cold air. Then turn the thermostat knob left to the + symbol. The adjustable temperature range is from 0F to 158F so that the heater reaches the set temperature of the heater and matches the temperature of the room.