Line voltage high quality portable tool… controlled output and temperature. Weller® "closed loop" method of controlling max tip temperature, protecting temperature sensitive components. Iron features stainless steel modular plug-in heater construction, greater soldering efficiency. 3-wire cord. Portable line-voltage irons require no base station. Temperature controlled by tip, with modular plug-in heater and fast heat-up. Line voltage high quality portable tool with controlled output and temperature.