- USB Cordless Soldering Kit with Built-in Lithium Battery eliminates wires and enables soldering anywhere. Widely used for repairing circuit boards, appliances, jewelry and metal crafts, computers, DIY projects, and small workplaces. - Easy Charging & Long Endurance: 800amh capacity battery. Charging time 50 minutes. Lasts for 20 minutes after full charge. Can work while charging. - Easy Operation: When the USB soldering iron is turned on, press and hold the power button for 8 seconds to heat up to 400C. Effectively melts solder on repair circuits. After work, place the tip on the stand and it will cool down within 1 minute. Ideal for beginners, hobbyists, basic household equipment, and engineers in training. - Portable and Safe: Soldering pen is 5.9 inch long and weighs 1.76 ounces, small and light enough to fit in a pocket. The 10 watt design offers safer use. - Practical Use Scenarios: PCB repair on computers and gadgets; appliance repair; jewelry and metal craft projects.