Standard stainles steel roof and side panals, simple controls and Chopper Technology dleivers the low maintenancce, long service life, easy operation ad great arc performance ever owner appreciates. This multi-porcess powerhouse features 500 amps at 100% duty cycle, or 575 amps at 50% testsed at temperatures up to 104 degress F. Don't pay extra for plenty of AC auxiliary power-12,000 watts while welding up to 250 amps is standard.