This is a digital hot air and solder station with a power supply.
There are 4 switches: one in the back and 3 in the front. Make sure to only turn on what you need. The solder iron stays at the temperature it is set. The hot air gun heats up when turned on, but will cool down when it is placed on the bracket again.
Heat all wires you want to solder and then add the solder wire to the joint.