This has to be the worst soldering iron I've bought, don't be fooled by the screen or the beautiful pictures, it's absolute rubbish, I have mine and on one Look the cheap plastic is a giant iron, the minus button didn't work at all a $5 device, they just added a screen and a button on the board that you can press because it still has a potentiometer on the board . I am really so disappointed that this is the worst $20 soldering iron I have ever bought. Please do your favor more money or just buy 5 maybe 10 bucks for one as a semi-professional amateur electrician I absolutely do not recommend this soldering iron 100%, btw 110/220 voltage and temp around the cheap thermal sensor.