The internal heating automatically sendingtin gun to prevent high temperature burns during operation. Fast heating, durable, long life, replaceable, assembled and disassembled. The side door design makes it easy to view internal operations and replace the heating core. Scientific design, not easy to get stuck! Can be operated with one hand, check the work situation at any time, efficient and convenient. With power switch, energy saving and safety. The tin wire scaffold is detachable and easy to use.