1.1. NEW DESIGN: Through the side design of the soldering iron set, you can observe the internal operation at any time. In addition, it is convenient to replace the heating core in the future. The housing is made of stainless steel, is corrosionresistant and more durable. 2.4. ONEHAND OPERATION: The soldering iron set feeds the welding wire via a stepper motor, allowing you to solder effortlessly with one hand without having to feed solder with the other hand. If the solder wire needs to be pulled out or replaced when it has stopped, simply press the plate upwards and remove the solder wire at the same time. 3.3. EASY TO USE: When using the hand soldering set for the first time, it needs to be preheated for a few minutes. It is normal for it to occur, which disappears after a few dozen seconds. Straighten the rated solder wire, press the solder inlet, insert it from the inlet until it touches the tip of the soldering iron, stop threading until the wire reaches the opening of the solder guide, then pull the trigger and it works properly. 4.2. INTEGRATED POWER SWITCH: The soldering has an integrated power switch, which is more energysaving and r to operate and use, and does not need to be plugged in and out frequently every time.