Upgrade USB Charging Welding KitExcellent adjustable temperature range: press and hold the switch key for 2 seconds to start, the green indicator temperature is 330-350C; single press the switch, the blue indicator temperature is 370-400C; single press the switch , the temperature of the red indicator light is: 430C-450C. Wide ApplicationsOur soldering iron kits are perfect for classroom electronics work, home and office as well as circuit design, jewelry, wood, crafts, DIY. SAFE AND ECO-FRIENDLY DESIGNOur soldering irons are made of only the highest quality materials and contain no toxic or polluting elements. QualityOur soldering irons are manufactured with quality in mind. Using smart design, smart heating elements and a comfortable grip, we"ve truly created the ultimate welding tool. Whether you"re a hobbyist or a professional, our customizable and durable soldering irons are the perfect tool for the job Suitable for Beginners ChoiceIt is the best choice for DIY lovers.