LOTOS TIG200 200A AC/DC Aluminum Tig/Stick Welder Square Wave Inverter with Pedal and Mask Automatic Dual Voltage (110VAC/220VAC), Dual Frequency ( 50Hz/60Hz ) Input Voltage: 110~220 VAC (Auto Detected-NO Switch is necessary) Square-wave inverter for accurate aluminum welding. Power efficiency: 80% Both HF start hand torch control and precise foot pedal welding heat control Housing Protection Grade: IP21 Certification: CE, CCC, CSA and ISO-9001 certification ETL Approved