Bromic Tungsten Smart-Heat TNG500-NG-USA Patio Heater is stainless steel with a high temperature ceramic coating that maximizes long life / durability in tough outdoor environments and a neutral black finish ensures it fits with all decors. The patented direct ignition system, never before seen on an outdoor gas radiant heater ensures a reliable start and effective operation. One or multiple units can be switched on / off simultaneously from a single remote-located switch and should the gas heater not re-ignite for any reason, the integrated Flame Failure Safety Shut-Off Control turns the heater off immediately. Components are within a stainless steel casing protecting from tampering and preventing dirt / dust from accumulating on the wiring and components.